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Слова на букву pius-ramp (15990)

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rack railway.
See cog railway. [1880-85] * * *
rack-and-pinion
/rak"euhn pin"yeuhn/, adj. of or pertaining to a mechanism in which a rack engages a pinion: rack-and-pinion steering. See illus. under rack1. [1900-05] * * *
rack-rent
—rack-renter, n. /rak"rent'/, n. 1. Also, rack rent. rent equal to or nearly equal to the full annual value of a property. v.t. 2. to exact the highest possible rent for. 3. to ...
rack-renter
rack-renter [rak′rent΄ər] n. one who pays or exacts rack-rent * * * See rack-rent. * * *
rackand pinion
rack and pinion n. A device for the conversion of rotary and linear motion, consisting of a pinion and a mated rack.   rackʹ-and-pinʹion (răkʹən-pĭnʹyən) adj. * * *
rackboard
/rak"bawrd', -bohrd'/, n. a board with holes into which organ pipes are fitted. [1850-55; RACK1 + BOARD] * * *
racker
See rack1. * * *
racket
racket1 /rak"it/, n. 1. a loud noise or clamor, esp. of a disturbing or confusing kind; din; uproar: The traffic made a terrible racket in the street below. 2. social excitement, ...
racketeer
/rak'i tear"/, n. 1. a person engaged in a racket. v.i. 2. to engage in a racket. [1925-30, Amer.; RACKET1 + -EER] * * *
racketeering
/rak'i tear"ing/, n. the practice of conducting or engaging in a racket, as extortion or bootlegging. [1925-30, Amer.; RACKETEER + -ING1] * * *
rackets
rack·ets (răkʹĭts) pl.n. (used with a sing. verb) Variant of racquets. * * * n [U] a ball game for two or four people played with rackets and a small hard ball in an ...
rackett
/rak"it/, n. ranket. * * * ▪ musical instrument also spelled  racket , also called  ranket   (from German Rank, “bend”), in music, double-reed wind instrument of the ...
rackety
/rak"i tee/, adj. 1. making or causing a racket; noisy. 2. fond of excitement or dissipation. [1765-75; RACKET1 + -Y1] * * *
Rackham
/rak"euhm/, n. Arthur, 1867-1939, English illustrator and painter. * * *
Rackham, Arthur
born Sept. 19, 1867, London, Eng. died Sept. 6, 1939, Limpsfield, Surrey British artist and illustrator. While a staff artist for a London newspaper, he also began illustrating ...
Rackham,Arthur
Rack·ham (răkʹəm), Arthur. 1867-1939. British artist known for his ethereal illustrations for children's books. * * *
racking
/rak"ing/, n. Masonry. the stepping back of the ends of courses successively from bottom to top in an unfinished wall to facilitate resumption of work or bonding with an ...
rackle
/rak"euhl/, adj. Chiefly Scot. headstrong; rash. [1250-1300; ME; perh. var. of RATTLE1; cf. RACKET1] * * *
rackrailway
rack railway n. See cog railway. * * *
rackwork
/rak"werrk'/, n. a mechanism utilizing a rack, as a rack and pinion. [1760-70; RACK1 + WORK] * * *
raclette
/rah klet", ra-/, n. Swiss Cookery. 1. a dish made by heating a piece of cheese, as over a hearth, and scraping off the melted part onto a plate: served with boiled potatoes. 2. ...
racon
/ray"kon/, n. See radar beacon. [1940-45, Amer.; ra(dar bea)con] * * *
raconteur
/rak'euhn terr"/; Fr. /rddann kawonn tuerdd"/, n., pl. raconteurs /-terrz"/; Fr. /-tuerdd"/. a person who is skilled in relating stories and anecdotes interestingly. [1820-30; < ...
raconteuse
/rak'euhn tuez", -toohz", -toohs"/; Fr. /rddann kawonn tuez"/, n., pl. raconteuses /-tue"ziz, -tooh"-, -tooh"siz/; Fr. /-tuez"/. a woman who is skilled in relating stories and ...
racoon
/ra koohn"/, n., pl. racoons, (esp. collectively) racoon. raccoon. * * *
racquet
/rak"it/, n. 1. racquets, (used with a sing. v.) a game played with rackets and a ball by two or four persons on a four-walled court. 2. racket2 (defs. 1, 2, 4). [var. of ...
racquetball
—racquetballer, n. /rak"it bawl'/, n. a game similar to handball, played on a four-walled court but with a short-handled, strung racket and a larger, somewhat softer ...
racquets
rac·quets also rack·ets (răkʹĭts) pl.n. (used with a sing. verb) A game played on a large, netless, four-walled court by two or four players with long-handled rackets and ...
racy
—racily, adv. —raciness, n. /ray"see/, adj., racier, raciest. 1. slightly improper or indelicate; suggestive; risqué. 2. vigorous; lively; spirited. 3. sprightly; piquant; ...
Raczynski, Count Edward Bernard Andre Maria
▪ 1994       Polish diplomat (b. Dec. 19, 1891, Zakopane, Poland—d. July 30, 1993, London, England), was a central figure in the Polish government-in-exile based in ...
rad
rad1 /rad/, n. Physics. a unit of absorbed dose equal to 0.01 Gy. Cf. dose (def. 4a). [1915-20; shortened form of RADIATION] rad2 /rad/, n. 1. Informal. radical. adj. 2. Slang. ...
rad-lib
/rad"lib"/, Informal. n. 1. Usually Disparaging. a liberal, esp. a liberal politician, considered to have radical or extremist tendencies. adj. 2. being or of such a liberal; ...
rad.
Math. 1. radical. 2. radix. * * *
rad/s
radians per second. Also, rad/sec. * * *
RADA
➡ Royal Academy of Dramatic Art. * * *
radar
/ray"dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the ...
radar astronomy
the branch of astronomy that uses radar to map the surfaces of planetary bodies, as the moon and Venus, and to determine periods of rotation. [1955-60] * * *
radar beacon
a radar device at a fixed location that, on receiving a radar signal, automatically transmits a particular radar signal in reply, identifying itself and enabling navigators of ...
radar picket
Mil. a ship, vehicle, or aircraft stationed at a distance from a protected force to increase radar detection range. [1950-55] * * *
radarastronomy
radar astronomy n. The branch of astronomy that studies bodies in the solar system by analyzing the reflections of radio waves sent from Earth. * * *
radarbeacon
radar beacon n. A fixed device that sends or receives, amplifies, alters, and returns a radar signal, permitting a distant receiver to determine its bearing and sometimes its ...
radargun
radar gun n. A usually hand-held device that measures the velocity of a moving object by sending out a continuous radio wave and measuring the frequency of reflected waves. * * *
radarman
/ray"dahr meuhn, -man'/, n., pl. radarmen /-meuhn, -men'/. a person who operates or helps to operate radar equipment. [1940-45; RADAR + MAN1] * * *
radarscope
/ray"dahr skohp'/, n. the viewing screen of radar equipment. [1945-50; RADAR + -SCOPE] * * *
radartelescope
radar telescope n. A large radar antenna used in radar astronomy. * * *
raḍāʿ
▪ Islamic law       (Arabic: “to suckle”), in Islam, a legal relationship established between children when they are nursed by the same woman, the result being that ...
Radbruch, Gustav
▪ German jurist born Nov. 21, 1878, Lubeck, Ger. died Nov. 23, 1949, Heidelberg       German jurist and legal philosopher, one of the foremost exponents of legal ...
Radcliff
/rad"klif/, n. a city in central Kentucky. 14,519. * * *
Radcliffe
/rad"klif/, n. Ann (Ward), 1764-1823, English writer of Gothic romances. * * *
Radcliffe, Ann
orig. Ann Ward born July 9, 1764, London, Eng. died Feb. 7, 1823, London English gothic novelist. Brought up in a well-to-do family, in 1787 she married a journalist who ...
Radcliffe, Daniel
▪ 2008 Daniel Jacob Radcliffe  born July 23, 1989, Fulham, London, Eng.  After mesmerizing millions of fans with his on-screen portrayal of the boy wizard Harry Potter, in ...
Radcliffe, Paula
▪ 2003       In October 2002 British distance runner Paula Radcliffe cut 89 seconds from the women's world record for the marathon, the biggest improvement in the event ...
Radcliffe, Ted
▪ 2006 Theodore Roosevelt Radcliffe; “Double Duty”  American baseball player (b. July 7, 1902, Mobile, Ala.—d. Aug. 11, 2005, Chicago, Ill.), was a star Negro League ...
Radcliffe,Ann Ward
Rad·cliffe (rădʹklĭf'), Ann Ward. 1764-1823. British writer of Gothic novels, including The Mysteries of Udolpho (1794). * * *
Radcliffe-Brown, A(lfred) R(eginald)
born Jan. 17, 1881, Birmingham, Warwick, Eng. died Oct. 24, 1955, London British social anthropologist. He taught at the universities of Cape Town, Sydney, Chicago, and Oxford. ...
Radcliffe-Brown, A.R.
▪ British anthropologist in full  Alfred Reginald Radcliffe-Brown  born Jan. 17, 1881, Birmingham, Warwick, Eng. died Oct. 24, 1955, London       English social ...
Raddall, Thomas Head
▪ Canadian author born November 13, 1903, Hythe, Kent, England died April 1, 1994, Liverpool, Nova Scotia, Canada       English-Canadian novelist, who accurately ...
raddle
raddle1 /rad"l/, v.t., raddled, raddling. to interweave; wattle. [1665-75; v. use of raddle lath < AF reidele pole, rail of a cart (OF redelle; cf. F ridelle)] raddle2 /rad"l/, ...
raddled
rad·dled (rădʹld) adj. Worn-out and broken-down.   [Origin unknown.] * * *
raddleman
/rad"l meuhn/, n., pl. raddlemen. ruddleman. * * *
radeau
/reuh doh"/, n., pl. radeaux /-doh", -dohz"/. an armed scow, variously rigged, used as a floating battery during the American Revolution. [1750-60; < F: raft < Pr radel < VL ...
radectomy
/reuh dek"teuh mee/, n., pl. radectomies. Dentistry, Surg. excision of part or all of the root of a tooth. [RAD(IX) + -ECTOMY] * * *
Radegunda, Saint
▪ Merovingian queen also spelled  Radegund, or Radegundis,  French  Sainte Radegonde  died Aug. 13, 587, Poitiers [now in France]; feast day August 13       queen ...
Radek
/rah"dek/; Russ. /rddah"dyik/, n. Karl /kahrddl/, 1885-1939?, Russian writer and politician. * * *
Radek, Karl
▪ Soviet official original name Karl Sobelsohn born 1885, Lemberg, Galicia, Austria-Hungary [now Lviv, Ukraine] died 1939?       Communist propagandist and early ...
Radek, Karl (Bernhardovich)
orig. Karl Sobelsohn born 1885, Lemberg, Galicia, Austria-Hungary died 1939? Russian communist politician. He took part in the Russian Revolution of 1905, then wrote for ...
Rademakers, Fons
▪ 2008 Alphonse Marie Rademakers        Dutch filmmaker born Sept. 5, 1920 , Roosendaal, Neth. died Feb. 22, 2007, Geneva, Switz. for his poignant drama De Aanslag ...
raden
▪ Japanese art       Japanese decorative technique used for lacquerware and woodenware, in which linings of mother-of-pearl or of abalone shells are cut into designs and ...
Rădescu, Nicolae
▪ prime minister of Romania born March 30, 1876, Bucharest, Rom. died May 16, 1953, New York, N.Y., U.S.       Romanian army officer and prime minister of Romania ...
Radetzky
/rddah dets"kee/, n. Count Joseph /yoh"zef/, 1766-1858, Austrian field marshal. * * *
Radetzky, Joseph, Count
born Nov. 2, 1766, Trebnice, Bohemia died Jan. 5, 1858, Milan Austrian army officer. He fought with distinction against the French in the Napoleonic Wars. As army chief of ...
Radetzky, Joseph, Graf
▪ Austrian military reformer in full  Johann Joseph Wenzel Anton Franz Karl, Graf Radetzky von Radetz  born November 2, 1766, Trebnice, Bohemia [now in Czech Republic] died ...
Radewyns, Florentius
▪ Dutch theologian original name  Florens Radewijns   born c. 1350, , Leerdam, Bishopric of Utrecht [now in The Netherlands] died March 24, 1400, Deventer       Dutch ...
Radford
/rad"feuhrd/, n. 1. Arthur William, 1896-1973, U.S. admiral: chairman of Joint Chiefs of Staff 1953-57. 2. a town in SW Virginia. 13,225. * * *
Radha
/rah"dah/, n. Hindu Legend. the milkmaid who became the consort of Krishna. * * * In Hindu mythology, mistress of the god Krishna when he lived among the cowherds of ...
Rādhā Soāmi Satsaṅg
▪ Indian religious group also called  Radhasvami Satsang,         esoteric religious sect of India that has followers among both Hindus and Sikhs. The sect was ...
Radhakrishnan
/rah'deuh krish"neuhn/, n. Sir Sarvepalli /sur'veuh pul"ee/, 1888-1975, president of India 1962-67. * * *
Radhakrishnan, Sarvepalli
▪ president of India born Sept. 5, 1888, Tiruttani, India died April 16, 1975, Madras  scholar and statesman who was president of India from 1962 to 1967. He served as ...
radi-
radi- pref. Variant of radio-. * * *
radial
—radiality, n. —radially, adv. /ray"dee euhl/, adj. 1. arranged like radii or rays. 2. having spokes, bars, lines, etc., arranged like radii, as a machine. 3. made in the ...
radial (arm) saw
radial (arm) saw or radial saw n. a circular saw suspended from a pivoted horizontal arm along which it can be moved * * *
radial (ply) tire
radial (ply) tire or radial tire n. a motor vehicle tire having a foundation of plies of rubberized cords running at right angles to the center line of the tread: it provides ...
radial engine
Aeron. an internal-combustion engine having the cylinders arranged in radial opposition, found mainly on older aircraft. [1905-10] * * * Type of internal-combustion engine used ...
radial keratotomy
Ophthalm. a surgical technique for correcting nearsightedness by making a series of spokelike incisions in the cornea to change its shape and focusing properties. [1975-80; ...
radial motion
Astron. the component of the motion of a star away from or toward the earth along its line of sight, expressed in miles or kilometers per second and determined by the shift in ...
radial saw
a cantilevered circular saw adjustable at various angles to the length of the work and to the perpendicular. * * *
radial symmetry
Biol. a basic body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis, characteristic of sessile and ...
radial tire
a motor-vehicle tire in which the plies or cords run from one bead to the other at right angles to both beads. See illustration under tire2.Also called radial. [1965-70] * * *
radial triangulation
Photogrammetry. triangulation based upon lines radiating from the center of each of two overlapping photographs to certain objects appearing on each photograph. * * *
radialengine
radial engine n. An internal-combustion engine, formerly used in propeller-driven aircraft, with cylinders arranged radially around the crankshaft. * * *
radialkeratotomy
radial keratotomy n. Abbr. RK Keratotomy involving a radial pattern of incisions, used to reduce or correct myopia. * * *
radially
See radial. * * *
radiallysymmetrical
See radial symmetry. * * *
radialsymmetry
radial symmetry n. Symmetrical arrangement of constituents, especially of radiating parts, about a central point.   radially symmetrical adj. * * *
radialtire
radial tire n. A pneumatic tire in which the ply cords extending to beads are laid at approximately right angles to the center line of the tread. * * *
radian
/ray"dee euhn/, n. Math. the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°. Abbr.: rad [1875-80; RADI(US) + -AN] * * *
radiance
/ray"dee euhns/, n. 1. radiant brightness or light: the radiance of the tropical sun. 2. warm, cheerful brightness: the radiance of her expression. 3. Rare. radiation. Also, ...
radiancy
/ray"dee euhn see/, n., pl. radiancies. radiance. [1640-50; RADI(ANT) + -ANCY] * * *
radiant
—radiantly, adv. /ray"dee euhnt/, adj. 1. emitting rays of light; shining; bright: the radiant sun; radiant colors. 2. bright with joy, hope, etc.: radiant smiles; a radiant ...
radiant emittance
Optics. radiant flux emitted per unit area. Also called radiant excitance /ik suyt"ns/. * * *
radiant energy
Physics. 1. energy transmitted in wave motion, esp. electromagnetic wave motion. 2. light1 (def. 2a). [1910-15] * * * ▪ physics        energy that is transferred by ...
radiant flux
Physics. the time rate of flow of radiant energy. [1915-20] * * *
radiant heat
Thermodynam. heat energy transmitted by electromagnetic waves in contrast to heat transmitted by conduction or convection. [1500-10] * * *
radiant heating
1. the means of heating objects or persons by radiation in which the intervening air is not heated. 2. a system for heating by radiation from a surface, esp. from a surface ...
radiantenergy
radiant energy n. Energy transferred by radiation, especially by an electromagnetic wave. * * *
radiantflux
radiant flux n. The rate of flow of radiant energy. * * *
radiantly
See radiant. * * *
Radiata
/ray'dee ay"teuh, -ah"teuh/, n. Biol. (in some classification systems) a major grouping that includes more or less radially symmetrical animals, as coelenterates (jellyfish, sea ...
radiate
—radiable, adj. —radiability, radiableness, n. —radiably, radiately, adv. v. /ray"dee ayt'/; adj. /ray"dee it, -ayt'/, v., radiated, radiating, adj. v.i. 1. to extend, ...
radiation
—radiational, adj. /ray'dee ay"sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by ...
radiation belt
Physics. See Van Allen belt. [1955-60] * * *
radiation damage
▪ crystallography       change in the ordered structure of crystalline material caused by interaction with radiation such as strong X-rays (X-ray), gamma rays (gamma ...
radiation fog
fog produced by the nocturnal cooling of the surface boundary layer to a temperature at which its content of water vapor condenses. Also called ground fog. [1855-60] * * *
radiation injury
Tissue damage caused by exposure to ionizing radiation. Structures with rapid cell turnover (e.g., skin, stomach or intestinal lining, and bone marrow) are most susceptible. ...
radiation measurement
▪ technology Introduction       technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for ...
radiation potential
Physics. the potential in volts that must be applied to an atom or molecule to cause it to emit radiation at one of its characteristic frequencies. * * *
radiation pressure
Physics. the pressure exerted on a surface by electromagnetic radiation or by sound waves. [1900-05] * * * Pressure on a surface resulting from electromagnetic radiation that ...
radiation sickness
Pathol. sickness caused by irradiation with x-rays or other nuclear radiation as a result of therapeutic treatment, accidental exposure, or a nuclear bomb explosion and ...
radiation therapy
radiotherapy. * * * or radiotherapy or therapeutic radiology Use of radiation sources to treat or relieve diseases, usually cancer (including leukemia). The ionizing radiation ...
radiation-damage dating
▪ paleontology       method of age determination that makes use of the damage to crystals and the radiation from radioactive substances caused by storage of energy in ...
radiational
See radiation. * * *
radiationalcooling
radiational cooling n. The cooling of the earth's surface and the air near the surface, occurring chiefly at night and caused by heat loss engendered by terrestrial radiation. * ...
radiationsickness
radiation sickness n. Illness induced by exposure to ionizing radiation, ranging in severity from nausea, vomiting, headache, and diarrhea to loss of hair and teeth, reduction in ...
radiative
/ray"dee ay'tiv/, adj. giving off radiation. Also, radiatory /ray"dee euh tawr'ee, -tohr'ee/. [1830-40; RADIAT(ION) + -IVE] * * *
radiative capture
Physics. the capture of a particle, as a neutron, by a nucleus, inducing the emission of electromagnetic radiation, as a gamma ray. [1930-35] * * *
radiator
/ray"dee ay'teuhr/, n. 1. a person or thing that radiates. 2. any of various heating devices, as a series or coil of pipes through which steam or hot water passes. 3. a device ...
radiator grille
a grille in an automobile or the like for air cooling of the liquid in the cooling system. [1955-60] * * *
radiatus
/ray'dee ay"teuhs/, adj. Meteorol. (of a cloud) having bands that appear to converge toward a point on the horizon. [ < NL, L: arranged radially, orig., having rays of light; see ...
Radić, Stjepan
▪ Croatian political leader born July 11, 1871, Trebarjevo, Croatia, Austria-Hungary [now in Yugoslavia] died Aug. 8, 1928, Zagreb, Kingdom of Serbs, Croats, and ...
radical
—radicalness, n. /rad"i keuhl/, adj. 1. of or going to the root or origin; fundamental: a radical difference. 2. thoroughgoing or extreme, esp. as regards change from accepted ...
radical axis
Geom. the line such that tangents drawn from any point of the line to two given circles are equal in length. [1840-50] * * *
radical chic
—radical-chic, adj. the patronage of extremists or left-wing radicals by rich or famous people, as through invitations to social functions or public expressions of ...
Radical Civic Union
▪ political party, Argentina Spanish  Unión Cívica Radical         major centre-left political party in Argentina. For much of the 20th century, the Radical Civic ...
Radical Democratic Party
▪ political party, Switzerland German  Freisinnig-Demokratische Partei der Schweiz (FDP) , French  Parti Radical-Démocratique Suisse (PRD) , Italian  Partito ...
radical empiricism
—radical empiricist. 1. (in the philosophy of William James) the doctrine that the only proper subject matter of philosophy is that which can be defined in terms of experience, ...
radical left
the faction representing extreme left-wing political views, often Marxist or Maoist in ideology. Cf. New Left. [1965-70] * * *
Radical Republican
Member of the Republican Party in the 1860s committed to the emancipation of slaves and the equal treatment and enfranchisment of blacks. Zealous antislavery advocates in the ...
radical right
—radical rightism. —radical rightist. the faction representing extreme right-wing political views; ultraconservatives; reactionaries. [1950-55] * * *
radical sign
Math. the symbol indicating extraction of a root of the quantity that follows it. [1660-70] * * *
Radical-Socialist Party
French political party. The oldest of France's political parties, it was founded in 1901 but originated in the 1870s in the reformist wing of the French Republican Party, known ...
radicalexpression
radical expression n. Mathematics An expression or form in which radical signs appear. * * *
radicalism
/rad"i keuh liz'euhm/, n. 1. the holding or following of radical or extreme views or principles. 2. the principles or practices of radicals. [1810-20; RADICAL + -ISM] * * *
radicalization
See radicalize. * * *
radicalize
—radicalization, n. /rad"i keuh luyz'/, v., radicalized, radicalizing. v.t. 1. to make radical or more radical, esp. in politics. v.i. 2. to become radical or more radical, ...
radically
/rad"ik lee/, adj. 1. with regard to origin or root. 2. in a complete or basic manner; thoroughly; fundamentally. [1600-10; RADICAL + -LY] * * *
radicalness
See radically. * * *
radicalsign
radical sign n. Mathematics 1. The sign √placed before a quantity, indicating extraction of the root designated by a raised integer. When extracting a square root, the raised ...
radicand
/rad"i kand', rad'i kand"/, n. Math. the quantity under a radical sign. [1895-1900; < L radicandum, neut. gerundive of radicare, deriv. of radix ROOT1] * * *
radicant
/rad"i keuhnt/, adj. Bot. rooting from the stem, as ivy. [1745-55; < L radicant- (s. of radicans, prp. of radicari to grow roots, take root), equiv. to radic- (s. of radix) ROOT1 ...
radicchio
/rah dee"kee oh', reuh-/, n. a variety of chicory originating in Italy, having a compact head of reddish, white-streaked leaves: leaves and roots may be cooked or used raw in ...
radicel
/rad"euh sel'/, n. Bot. a minute root; a rootlet. [1810-20; < NL radicella small root, rootlet, equiv. to L radic- (s. of radix) ROOT1 + -ella -ELLE] * * *
radices
/rad"euh seez', ray"deuh-/, n. a pl. of radix. * * *
radicle
/rad"i keuhl/, n. 1. Bot. a. the lower part of the axis of an embryo; the primary root. See diag. under plumule. b. a rudimentary root; radicel or rootlet. 2. Chem. (formerly) ...
radicular
/ra dik"yeuh leuhr/, adj. 1. Bot. of or pertaining to a radicle or root. 2. Anat. of, pertaining to, or involving a radicle. [1820-30; < L radicul(a) RADICLE + -AR1] * * *
radiculitis
/ra dik'yeuh luy"tis/, n. Pathol. inflammation of a spinal nerve root. [1905-10; < NL; see RADICLE, -ITIS] * * *
Radiguet, Raymond
▪ French author born June 18, 1903, Saint-Maur, Fr. died Dec. 12, 1923, Paris       precocious French novelist and poet who wrote at 17 a masterpiece of astonishing ...
radii
/ray"dee uy'/, n. a pl. of radius. * * *
Radin
/rayd"n/, n. Paul, 1883-1959, U.S. anthropologist, born in Poland. * * *
Radin, Paul
▪ American anthropologist born April 2, 1883, Łódź, Pol. died Feb. 21, 1959, New York City       U.S. anthropologist who was influential in advancing a historical ...
radio
/ray"dee oh'/, n., pl. radios, adj., v., radioed, radioing. n. 1. wireless telegraphy or telephony: speeches broadcast by radio. 2. an apparatus for receiving or transmitting ...
Radio 1
a British national radio station of the BBC that broadcasts pop music and news, and is listened to mainly by young people. It was established in 1967 and broadcasts 24 hours a ...
Radio 2
a British national radio station of the BBC that broadcasts popular music, jazz, news and sport, and is listened to mainly by older people. It was established in 1967 and before ...
Radio 3
a British national radio station of the BBC that broadcasts mainly classical music, but also presents plays, talks and readings of short stories and poetry. It was established in ...
Radio 4
a British national radio station of the BBC. It broadcasts regular news and weather reports as well as plays, comedy shows, live broadcasts of important events, and other ...
Radio 5 Live
a British national radio station of the BBC that broadcasts mainly sport, music and talk programmes. It was established in 1990 and broadcasts 24 hours a day. * * *
radio and radar astronomy
Study of celestial bodies by measuring the energy they emit or reflect at radio wavelengths. It began in 1931 with Karl Jansky's discovery of radio waves from an ...
radio astronomy
the branch of astronomy that utilizes extraterrestrial radiation in radio wavelengths rather than visible light for the study of the universe. [1945-50] * * *
radio beacon
a radio station that sends a characteristic signal so as to enable ships or airplanes to determine their position or bearing by means of a radio compass. [1915-20] * * *
radio beam
beam (def. 12). [1920-25] * * *
radio car
an automobile, esp. a police car or taxi, equipped with a two-way radio for communication. [1920-25] * * *
Radio Caroline
a British pirate radio station (= an illegal station), started in 1964, which broadcast pop music from a ship at sea. It was extremely successful and led to the forming of ...
Radio City Music Hall
the largest cinema and theatre in the world, with more than 6 000 seats. It is in Rockefeller Center in New York. It combines films with stage performances by the famous ...
radio compass
a radio receiver with a directional antenna for determining the bearing of the receiver from a radio transmitter. [1915-20] * * *
radio control
radio control n. control as of pilotless aircraft, garage doors, etc. by means of radio signals * * *
radio direction finder
a navigational aid establishing a fix by means of the bearings of two known radio stations. Abbr.: RDF [1920-25] * * * ▪ instrument also called  Radio Compass, ...
Radio Free Europe/Radio Liberty
a federally funded private organization that broadcasts news and entertainment to formerly Communist countries, esp. the Russian Federation, Czech Republic, Poland, Hungary, ...
radio frequency
radio frequency n. any frequency between normally audible sound waves and the infrared light portion of the spectrum, lying between c. 10 kilohertz and c. 1,000,000 megahertz * * ...
radio galaxy
a galaxy that emits much more strongly in the radio part of the spectrum than does a typical galaxy. [1955-60] * * *
radio horizon
the locus of points on the earth's surface where rays from a transmitting antenna are tangent to the surface. The radio horizon for a fixed antenna varies with refraction by the ...
radio interferometer
Astron. any of several different types of instrumentation designed to observe interference patterns of electromagnetic radiation at radio wavelengths: used in the discovery and ...
radio knife
Surg. an electrical instrument for cutting tissue that by searing severed blood vessels seals them and prevents bleeding. * * *
radio range
▪ navigation       in aerial navigation, a system of radio transmitting stations, each of which transmits a signal that not only carries identification but also is of ...
radio range beacon
a radio transmitter that utilizes two or more directional antennas and transmits signals differing with direction, permitting a flier receiving a signal to determine his or her ...
radio shack
Informal. a room or structure, as on a ship, for housing radio equipment. [1945-50] * * *
Radio Shack{™}
any of a US group of about 6 800 shops that sell a wide range of electrical goods, including computers and video and sound equipment. * * *
radio source
Astron. a cosmic object or phenomenon, as a galaxy, pulsar, quasar, or the remnant of a supernova or of a galactic collision, that emits radio waves. [1945-50] * * * ▪ ...
radio spectrum
the portion of the electromagnetic spectrum that includes radio waves. [1925-30] * * *
radio star
Astron. Now Rare. a radio source. [1945-50] * * *
radio station.
station (def. 8). [1910-15] * * *
radio stations
➡ radio * * *
radio taxi
a taxi in two-way radio communication with a dispatcher, who sends it directly to persons who phone in for a taxi. * * *
radio telescope
Astron. a system consisting of an antenna, either parabolic or dipolar, used to gather radio waves emitted by celestial sources and bring them to a receiver placed in the ...
Radio Times
a British magazine published every week by the BBC. It gives details of the week’s radio and television programmes on both BBC and commercial stations, and also contains ...
radio tube
a vacuum tube used in a radio receiving set. * * *
radio wave
Elect. an electromagnetic wave having a wavelength between 1 millimeter and 30,000 meters, or a frequency between 10 kilohertz and 300,000 megahertz. [1915-20] * * * Wave from ...
radio window
Astron. the range of wavelengths at which the earth's atmosphere is transparent to radio waves. * * *
radio-
a combining form with the meanings "dealing with radiant energy" (radiometer), "employing or dealing with radio waves" (radioacoustics; radiolocation; radiotelephone), "emitting ...
radio-frequency heating
▪ physics Introduction       process of heating (heat) materials through the application of radio waves of high frequency—i.e., above 70,000 hertz (cycles per ...
radio-phonograph
☆ radio-phonograph [rā΄dē ō fō′nə graf΄, rā΄dē ō fō′nəgräf΄ ] n. a radio and phonograph combined in one unit and sharing some components, as the amplifier ...
RADIO: The Boom of Science-Fiction TV
▪ 1997       "Star Trek," the show whose mission was "to boldly go where no man has gone before," celebrated its 30th anniversary in 1996. First televised in 1966, the ...
radioacoustics
/ray'dee oh euh kooh"stiks/, n. (used with a sing. v.) the science and technology of the production, transmission, and reproduction of sounds carried by radio waves. [RADIO- + ...
radioactinium
/ray'dee oh ak tin"ee euhm/, n. Chem. the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227 [1905-10; RADIO- + ...
radioactivate
/ray'dee oh ak"teuh vayt'/, v.t., radioactivated, radioactivating. Physics. to make (a substance) radioactive. [1900-05; RADIOACTIVE + -ATE1] * * *
radioactive
—radioactively, adv. /ray'dee oh ak"tiv/, adj. Physics, Chem. of, pertaining to, exhibiting, or caused by radioactivity. [1895-1900; RADIO- + ACTIVE] * * *
radioactive dating
☆ radioactive dating n. the determination of the age of an artifact, bone, rock, etc. based on the known rates of decay of radioactive isotopes of various elements * * *
radioactive dating.
See radiometric dating. * * *
radioactive decay
Physics. decay (def. 8). [1960-65] * * *
radioactive fallout
      the deposition of radioactive materials on the Earth from the atmosphere. See fallout. * * *
radioactive fallout.
See under fallout. * * *
radioactive isotope
▪ chemistry also called  radioisotope   any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by ...
radioactive series
Physics, Chem. a succession of elements initiated in the radioactive decay of a parent, as thorium or uranium, each of which decays into the next until a stable element, usually ...
radioactive waste
the radioactive by-products from the operation of a nuclear reactor or from the reprocessing of depleted nuclear fuel. Also called nuclear waste. [1945-50] * * *
radioactivedecay
radioactive decay n. 1. Spontaneous disintegration of a radionuclide accompanied by the emission of ionizing radiation in the form of alpha or beta particles or gamma rays. 2. An ...
radioactively
See radioactive. * * *
radioactiveseries
radioactive series n. A group of isotopes representing various stages of radioactive decay in which the heavier members of the group are transformed into successively lighter ...
radioactivity
/ray'dee oh ak tiv"i tee/, n. Physics, Chem. the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in ...
radioastronomer
See radio astronomy. * * *
radioastronomy
radio astronomy n. The branch of astronomy that deals with the origin and nature of emissions from extraterrestrial sources in the radio wave range of electromagnetic radiation ...
radioautograph
/ray'dee oh aw"teuh graf', -grahf'/, n. autoradiograph. [1940-45; RADIO- + AUTOGRAPH] * * *
radioautography
/ray'dee oh aw tog"reuh fee/, n. autoradiography. [1940-45; RADIO- + AUTO- + -GRAPHY] * * *
radiobeacon
radio beacon n. A fixed radio transmitter that broadcasts distinctive signals as a navigational aid. * * *
radiobeam
radio beam n. A focused beam of radio signals transmitted by a radio beacon to guide aircraft or ships. * * *
radiobiological
See radiobiology. * * *
radiobiologist
See radiobiological. * * *
radiobiology
—radiobiological /ray'dee oh buy'euh loj"i keuhl/, radiobiologic, adj. —radiobiologist, n. /ray'dee oh buy ol"euh jee/, n. the branch of biology dealing with the effects of ...
radiobroadcast
—radiobroadcaster, n. n. /ray"dee oh brawd'kast, -kahst/; v. /ray'dee oh brawd"kast', -kahst'/, n., v., radiobroadcast or radiobroadcasted, radiobroadcasting. n. 1. a broadcast ...
radiobroadcaster
See radiobroadcast. * * *
radiocarbon
/ray'dee oh kahr"beuhn/, n. Chem. 1. Also called carbon 14. a radioactive isotope of carbon with mass number 14 and a half-life of about 5730 years: widely used in the dating of ...
radiocarbon dating
the determination of the age of objects of organic origin by measurement of the radioactivity of their carbon content. Also called carbon-14 dating. Cf. radiometric ...
radiocarbondating
radiocarbon dating n. The determination of the approximate age of an ancient object, such as an archaeological specimen, by measuring the amount of carbon 14 it contains. Also ...
radiocast
/ray"dee oh kast', -kahst'/, n., v., radiocast or radiocasted, radiocasting. n. 1. a radiobroadcast. v.t., v.i. 2. to broadcast via radio. [1920-25; RADIO + (BROAD)CAST] * * *
radiocesium
/ray'dee oh see"zee euhm/, n. Chem. See cesium 137. [1950-55; RADIO- + CESIUM] * * *
radiochemical
/ray'dee oh kem"i keuhl/, adj. Chem. pertaining to or involving radiochemistry. [1910-15; RADIO- + CHEMICAL] * * *
radiochemistry
—radiochemist, n. /ray'dee oh kem"euh stree/, n. the chemical study of radioactive elements, both natural and artificial, and their use in the study of chemical ...
radiochromatography
/ray'dee oh kroh'meuh tog"reuh fee/, n. Chem. chromatography in which radiolabeled substances on the chromatogram are determined quantitatively or qualitatively by measuring ...
radiocollar
radio collar n. A collar fitted with a small radio transmitter that when attached to a wild animal can be used in tracking the animal's movements by radio telemetry. * * *
radiocompass
radio compass n. A navigational aid consisting of an automatic radio receiver and a directional antenna that determine the transmission direction of incoming radio waves. * * *
radiodiagnosis
/ray'dee oh duy'euhg noh"sis/, n., pl. radiodiagnoses /-seez/. Med. diagnosis by means of radiography or radioscopy. [1900-05; RADIO- + DIAGNOSIS] * * *
radioecological
See radioecology. * * *
radioecologist
See radioecological. * * *
radioecology
ra·di·o·e·col·o·gy (rā'dē-ō-ĭ-kŏlʹə-jē) n. The study of the effects of radiation and radioisotopes on an ecological population or ...
radioelement
/ray'dee oh el"euh meuhnt/, n. Chem. a radioactive element. [1900-05; RADIO- + ELEMENT] * * *
radiofrequency
/ray'dee oh free"kweuhn see/, n., pl. radiofrequencies. 1. the frequency of the transmitting waves of a given radio message or broadcast. 2. a frequency within the range of radio ...
radiogalaxy
radio galaxy n. A galaxy emitting large amounts of radio energy. * * *
radiogenic
/ray'dee oh jen"ik/, adj. 1. Physics. produced by radioactive decay: radiogenic lead; radiogenic heat. 2. having qualities or characteristics that broadcast well; suitable for ...
radiogram
radiogram1 /ray"dee oh gram'/, n. a message transmitted by radiotelegraphy. [1900-05; RADIO- + -GRAM1] radiogram2 /ray"dee oh gram'/, n. Brit. a combination radio and record ...
radiograph
/ray"dee oh graf', -grahf'/, n. 1. Also called shadowgraph. a photographic image produced by the action of x-rays or nuclear radiation. v.t. 2. to make a radiograph of. [1875-80; ...
radiographer
See radiograph. * * *
radiographic
See radiographer. * * *
radiographically
See radiographer. * * *
radiography
—radiographer, n. —radiographic /ray'dee oh graf"ik/, radiographical, adj. —radiographically, adv. /ray'dee og"reuh fee/, n. the production of radiographs. [1895-1900; ...
Radiohead
a British pop group formed in 1988. Their most successful albums include The Bends (1995) and OK Computer (1997). * * * ▪ 2004       In 2003, as it had since the late ...
radioimmunoassay
/ray'dee oh im'yeuh noh as"ay, -a say", -i myooh'-/, n. a test procedure that integrates immunologic and radiolabeling techniques to measure minute quantities of a substance, as ...
radioimmunological
See radioimmunology. * * *
radioimmunology
—radioimmunological /ray'dee oh im'yeuh nl oj"i keuhl, -i myooh'-/, adj. /ray'dee oh im'yeuh nol"euh jee/, n. the study of biological substances or processes with the aid of ...
radioiodine
/ray'dee oh uy"euh duyn', -din, -deen'/, n. Chem. any of nine radioisotopes of iodine, esp. iodine 131 and iodine 125, used as radioactive tracers in research and clinical ...
radioiron
/ray'dee oh uy"euhrn/, n. Chem. the radioactive isotope of iron, with atomic weight 59 and a half-life of 46 days: used chiefly as a tracer in biochemistry. [1955-60; RADIO- + ...
radioisotope
—radioisotopic /ray'dee oh uy'seuh top"ik/, adj. /ray'dee oh uy"seuh tohp'/, n. a radioactive isotope, usually artificially produced: used in physical and biological research, ...
radiolabel
/ray'dee oh lay"beuhl/, v.t., radiolabeled, radiolabeling or (esp. Brit.) radiolabelled, radiolabelling. Chem. label (def. 12). [1950-55; RADIO- + LABEL] * * *
radioland
/ray"dee oh land'/, n. (sometimes cap.) Often Facetious. the aggregate of listeners within the reach of a radio station's transmission. [RADIO + -LAND] * * *
radiolarian
/ray'dee oh lair"ee euhn/, n. any minute, marine protozoan of the class Radiolaria, or, in some classification schemes, the superclass Actinopoda, having an amebalike body with ...
radiolocation
/ray'dee oh loh kay"sheuhn/, n. the method or process of determining the position and velocity of an object by radar. [1940-45; RADIO- + LOCATION] * * *
radiolocator
/ray"dee oh loh'kay teuhr, -loh kay'teuhr/, n. Brit. radar. [1940-45; RADIO- + LOCATOR] * * *
radiologic
See radiological. * * *


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