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Слова на букву !kun-arti (15990)

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See acquisitively. * * *
—acquitter, n. /euh kwit"/, v.t., acquitted, acquitting. 1. to relieve from a charge of fault or crime; declare not guilty: They acquitted him of the crime. The jury acquitted ...
/euh kwit"l/, n. 1. the act of acquitting; discharge. 2. the state of being acquitted; release. 3. the discharge or settlement of a debt, obligation, etc. 4. Law. judicial ...
/euh kwit"ns/, n. 1. the act of acquitting. 2. the discharge of a debt or obligation. 3. a document or receipt as evidence of the discharge of a debt or obligation. [1300-50; ME ...
➡ legal system * * *
See acquit. * * *
var. of acro- before a vowel: acronym. * * *
/euh kral"deuh huyd'/, n. Chem. acrolein. [1865-70; < L acr- (s. of acer) sharp + ALDEHYDE] * * *
▪ slime mold       class name for cellular slime molds (division Myxomycophyta). The class contains a single order, Acrasiales, and about a dozen species. The vegetative ...
/euh kray"sin/, n. Mycol. a chemotactic substance, identical with cAMP, secreted by myxamebas of cellular slime molds and attracting other myxamebas to aggregate and form a ...
/ay"keuhr/, n. 1. a common variable unit of land measure, now equal in the U.S. and Great Britain to 43,560 square feet or 1/640 square mile (4047 square meters). 2. acres, a. ...
/ah"kreuh/ for 1; /ah"keuhr, ay"keuhr/ for 2, n. 1. a state in W Brazil. 301,628; 58,900 sq. mi. (152,550 sq. km). Cap.: Rio Branco. 2. a seaport in NW Israel: besieged and ...
acre right
U.S. Hist. the right of a settler to purchase land that the settler has occupied or improved. * * *
Acre River
▪ river, Brazil Portuguese  Rio Acre,         river, chiefly in western Brazil, rising on the Peruvian border, along which it continues eastward to form part of the ...
/ay"keuhr foot"/, n. a unit of volume of water in irrigation: the amount covering one acre to a depth of one foot, equal to 43,560 cubic feet. [1900-05, Amer.] * * *
/ay"keuhr inch"/, n. one-twelfth of an acre-foot, equal to 3630 cubic feet. [1905-10, Amer.] * * *
/ay"keuhr ij/, n. 1. extent or area in acres; acres collectively. 2. a plot of land amounting to approximately one acre: They bought an acreage on the outskirts of ...
/ay"keuhrd/, adj. owning many acres of land; landed. [1835-45; ACRE + -ED3] * * *
—acridity /euh krid"i tee/, acridness, n. —acridly, adv. /ak"rid/, adj. 1. sharp or biting to the taste or smell; bitterly pungent; irritating to the eyes, nose, etc.: acrid ...
/ak"ri did/, n. locust (def. 1). [ < NL Acrididae. equiv. to Acrid(a) a genus of grasshoppers ( < Gk akríd-, s. of akrís grasshopper + L -a -A2) + -idae -ID2] * * *
/ak"ri deen', -din/, n. Chem. a colorless, crystalline solid, C13H9N, usually obtained from the anthracine fraction of coal tar: used chiefly in the synthesis of dyes and ...
See acrid. * * *
See acridity. * * *
See acridity. * * *
/ak'reuh flay"vin, -veen/, n. Chem. an orange-brown, granular solid, C14H14N3Cl: used chiefly in medicine as an antiseptic. Also called neutral acriflavine, euflavine, ...
acriflavine hydrochloride
Chem. the reddish-brown, crystalline, water-soluble hydrochloride of acriflavine, used similarly. Also called trypaflavine, flavine. * * *
/ak"reuh lan'/, Trademark. a brand name for an acrylic fiber used in textiles, characterized chiefly by softness, strength, and wrinkle-resistant properties. * * *
—acrimoniously, adv. —acrimoniousness, n. /ak'reuh moh"nee euhs/, adj. caustic, stinging, or bitter in nature, speech, behavior, etc.: an acrimonious answer; an acrimonious ...
See acrimonious. * * *
See acrimoniously. * * *
/ak"reuh moh'nee/, n. sharpness, harshness, or bitterness of nature, speech, disposition, etc.: The speaker attacked him with great acrimony. [1535-45; < L acrimonia, equiv. to ...
A·cris·i·us (ə-krĭzʹē-əs) n. Greek Mythology A king of Argos and father of Danaë who was killed by his grandson Perseus. * * *
▪ FAO soil group  one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Acrisols form on old landscapes that have an ...
—acritarchous, adj. /ak"ri tahrk'/, n. Paleontol. any of various microfossils, of unknown biological affinities, having a central cavity enclosed by a wall of chiefly organic ...
/ay krit"i keuhl/, adj. 1. not critical. 2. Med. (of a disease) not showing a crisis. [1860-65; A-6 + CRITICAL] * * *
a combining form with the meanings "height," "tip end," "extremities of the body," used in the formation of compound words: acrophobia. Also, esp. before a vowel, acr-. [ < Gk, ...
/ak"reuh bat'/, n. 1. a skilled performer of gymnastic feats, as walking on a tightrope or swinging on a trapeze. 2. a person who readily changes viewpoints or ...
—acrobatically, adv. /ak'reuh bat"ik/, adj. 1. of, pertaining to, or like an acrobat or acrobatics. 2. having the good balance, agility, and coordination of an acrobat. Also, ...
See acrobatic. * * *
/ak'reuh bat"iks/, n. 1. (used with a pl. v.) the feats of an acrobat; gymnastics. 2. (used with a sing. v.) the art or practice of acrobatic feats. 3. (used with a pl. v.) ...
/ak'reuh kahr"peuhs/, adj. Bot. having the reproductive organ at the end of the primary axis. [1860-65; < NL acrocarpus < Gk akrókarpos. See ACRO-, -CARPOUS] * * *
/ak'reuh sen"trik/, adj. Genetics. of or pertaining to any chromosome or chromatid whose centromere is closer to one end than to the other, creating two unequal chromosome arms. ...
See acrocephaly. * * *
▪ congenital disorder also called  Apert syndrome        congenital malformation of the skeleton affecting the skull and limbs. The disorder most often is ...
—acrocephalic /ak'roh seuh fal"ik/, adj., n. —acrocephalous, adj. /ak'reuh sef"euh lee/, n. Pathol. oxycephaly. Also, acrocephalia /ak'roh seuh fayl"yeuh/. [1875-80; ACRO- + ...
/ak'reuh kawr"inth, -kor"-/, n. the citadel of ancient Corinth: strategic in the control of the Isthmus of Corinth; extensive ruins. * * *
/ak'roh suy'euh noh"sis/, n. Pathol. cyanosis of the extremities, characterized by blueness and coldness of the fingers and toes. [ < NL; see ACRO-, CYANOSIS] * * * ▪ ...
—acrodontism, n. /ak"reuh dont'/, adj. Zool. having rootless teeth fastened to the alveolar ridge of the jaws. [1840-50; ACR- + -ODONT] * * *
—acrogenic /ak'reuh jen"ik/, acrogenous /euh kroj"euh neuhs/, adj. —acrogenously, adv. /ak"reuh jeuhn, -jen'/, n. Bot. a flowerless plant growing and producing its ...
/euh kroj"euh neuhs/, adj. Bot. having the female reproductive organ arising from the apical cell of the stem, thereby terminating its growth, as certain liverworts. Cf. ...
—acrolectal, adj. /ak"reuh lekt'/, n. Ling. the variety of language in a creole continuum that approximates most closely the standard variety of a major international language, ...
See acrolect. * * *
/euh kroh"lee in/, n. Chem. a yellow, flammable liquid, C3H4O, having a stifling odor, usually obtained by the decomposition of glycerol: used chiefly in the synthesis of ...
—acrolithic, adj. /ak"reuh lith/, n. a sculptured figure having the head and extremities of stone and the torso of other material. [1840-50; < L acrolithus < Gk akrólithos. ...
—acrologic /ak'reuh loj"ik/, adj. —acrologically, adv. /euh krol"euh jee/, n., pl. acrologies. acrophony. [ < F acrologie. See ACRO-, -LOGY] * * *
See acromegaly. * * *
—acromegalic /ak'roh meuh gal"ik/, adj. /ak'reuh meg"euh lee/, n. Pathol. a chronic disease characterized by enlargement of the bones of the head, the soft parts of the feet ...
ac·ro·mel·ic (ăk'rō-mĕlʹĭk) adj. Of or relating to the end of the extremities.   [From acro- + Greek melos, limb.] * * *
See acromion. * * *
/ak'reuh mik"ree euh, -muy"kree euh/, n. Pathol. abnormal smallness of the head and extremities. [ < NL; see ACRO-, MICRO-, -IA] * * *
—acromial, adj. /euh kroh"mee euhn/, n., pl. acromia /-mee euh/. Anat. the outward end of the spine of the scapula or shoulder blade. See diag. under shoulder. [1605-15; < NL < ...
—acronal /ak"reuh nl/, adj. /ak"ron, -reuhn/, n. the unsegmented, preoral portion of the body of an arthropod. [ < NL < Gk ákron, neut. sing. of ákros; see ACRO-] * * *
acronical or acronycal [ə krän′i kəl] adj. 〚Gr akronychos, at sunset < akros (see ACRO-) + nyx, NIGHT〛 Astron. happening at sunset, as the rising of a star * * *
—acronymic, acronymous /euh kron"euh meuhs/, adj. —acronymically, adv. /ak"reuh nim/, n. 1. a word formed from the initial letters or groups of letters of words in a set ...
See acronym. * * *
See acronymic. * * *
/euh krop"euh thee/, n. Pathol. any disease of the extremities. [ACRO- + -PATHY] * * *
—acropetally, adv. /euh krop"i tl/, adj. Bot. (of an inflorescence) developing upward, toward the apex. [1870-75; ACRO- + -PETAL] * * *
See acropetal. * * *
See acrophobia. * * *
—acrophobic, adj., n. /ak'reuh foh"bee euh/, n. a pathological fear of heights. [1890-95; < NL; see ACRO-, -PHOBIA] * * *
See acrophobe. * * *
—acrophonic /ak'reuh fon"ik/, acrophonetic /ak'reuh feuh net"ik/, adj. —acrophonically, acrophonetically, adv. /euh krof"euh nee/, n., pl. acrophonies. 1. the use of what was ...
—acropolitan /ak'reuh pol"i tn/, adj. /euh krop"euh lis/, n. 1. the citadel or high fortified area of an ancient Greek city. 2. the Acropolis, the citadel of Athens and the ...
Acropolites, George
▪ Byzantine statesman and scholar Acropolites also spelled  Akropolites  born 1217, Constantinople, Byzantine Empire [now Istanbul, Turkey] died 1282, ...
See acrosome. * * *
—acrosomal, adj. /ak"reuh sohm'/, n. Cell Biol. an organelle covering the head of animal sperm and containing enzymes that digest the egg cell coating, thus permitting the ...
/ak"reuh spuyeur'/, n. Bot. the first sprout appearing in the germination of grain; the developed plumule of the seed. [1610-20; ACRO- + SPIRE1; r. akerspire, equiv. to aker (OE ...
—acrosporous /ak'reuh spawr"euhs, -spohr"-, euh kros"peuhr euhs/, adj. /ak"reuh spawr', -spohr'/, n. Mycol. a spore borne at the tip of a sporophore, as a ...
/euh kraws", euh kros"/, prep. 1. from one side to the other of: a bridge across a river. 2. on or to the other side of; beyond: across the sea. 3. into contact with; into the ...
/euh kraws"dheuh bawrd", -bohrd", euh kros"-/, adj. 1. applying to all employees, members, groups, or categories; general: The across-the-board pay increase means a raise for all ...
—acrostically, adv. /euh kraw"stik, euh kros"tik/, n. 1. a series of lines or verses in which the first, last, or other particular letters when taken in order spell out a word, ...
See acrostic. * * *
/ak'reuh tear"ee on', -ee euhn/, n., pl. acroteria /-tear"ee euh/. acroterium. [ < Gk akrotérion topmost part, extremity, equiv. to akro- ACRO- + -terion suffix designating a ...
—acroteral, acroterial, adj. /ak'reuh tear"ee euhm/, n., pl. acroteria /-tear"ee euh/. Archit. a pedestal for a sculpture or ornament at each base or at the apex of a ...
—acrotic /euh krot"ik/, adj. /ak"reuh tiz'euhm/, n. Pathol. absence or weakness of the pulse. [1850-55; A-6 + Gk krót(os) beating or rhythmical sound + -ISM] * * *
ACRR abbr. American Council on Race Relations. * * *
/ay"kruks/, n. Astron. a star of the first magnitude in the constellation Southern Cross. [A (alpha) + CRUX] * * *
/ak'ril al"deuh huyd'/, n. Chem. acrolein. Also called acrylic aldehyde. [ACRYL(IC) + ALDEHYDE] * * *
/euh kril"euh muyd', -mid, ak'reuh lam"uyd, -id/, n. Chem. a colorless, odorless, toxic crystalline compound, C3H5NO, soluble in water, alcohol, and acetone: used in the ...
/ak"reuh layt', -lit/, n. Chem. a salt or ester of an acrylic acid. [1870-75; ACRYL(IC) + -ATE2] * * *
ac·ry·late resin (ăkʹrə-lāt') n. Any of a class of acrylic resins used in emulsion paints, adhesives, plastics, and textile and paper finishes. Also called acrylate. * * *
/euh kril"ik/, adj. 1. of or derived from acrylic acid. n. 2. See acrylic fiber. 3. See acrylic resin. 4. a paint, prepared esp. for artists, in which an acrylic resin serves as ...
acrylic acid
Chem. a colorless, corrosive liquid, C3H4O2, having an acrid odor, usually derived from acrolein by oxidation: used esp. in the synthesis of acrylic resins. [1850-55] * * *
acrylic color
acrylic color n. a color or paint made by mixing pigments in a solution of acrylic resin: also acrylic paint * * *
acrylic compound
Any of a class of synthetic plastics, resins, and oils used to manufacture many products. By varying the starting reagents (such as acrylic acid, C3H4O2, or acrylonitrile, ...
acrylic ester
any of a series of esters derived from the acrylic acids. * * *
acrylic fiber
Chem. any of the group of synthetic textile fibers, as Orlon, made by the polymerization of acrylonitrile as the principal component with one or more other monomers. [1950-55] * ...
acrylic painting
acrylic painting a painting done with pigments in a solution of an acrylic resin: it dries quickly with a brilliance and depth comparable to those of both watercolor and oil ...
acrylic resin
Chem. any of a group of thermoplastic resins formed by polymerizing the esters of amides of acrylic or methacrylic acid: used chiefly where transparency is desired, as in the ...
acrylic acid n. An easily polymerized, colorless, corrosive liquid, H2C:CHCOOH, used as a monomer for acrylate resins. * * *
acrylic fiber n. Any of numerous synthetic fibers polymerized from acrylonitrile. * * *
acrylic resin n. Any of numerous thermoplastic or thermosetting polymers or copolymers of acrylic acid, methacrylic acid, esters of these acids, or acrylonitrile, used to produce ...
/ak'reuh loh nuy"tril, -treel, -truyl/, n. Chem. a colorless, flammable, poisonous, carcinogenic liquid, C3H3N, used for the production of polymers and copolymers, as rubbers, ...
/ak"reuh lil/, adj. Chem. containing the acrylyl group. [ACRYL(IC) + -YL] * * *
acrylyl group
Chem. the univalent group C3H3O-, derived from acrylic acid. Also called acrylyl radical. * * *
ACS abbrev. 1. American Cancer Society 2. American Chemical Society * * * ACS abbr. 1. American Chemical Society. 2. American College of Surgeons. * * *
ACSW abbrev. Academy of Certified Social Workers * * *
/akt/, n. 1. anything done, being done, or to be done; deed; performance: a heroic act. 2. the process of doing: caught in the act. 3. a formal decision, law, or the like, by a ...
1. American College Test. 2. Association of Classroom Teachers. 3. Australian Capital Territory. * * * (as used in expressions) sacramental act Ballot Act British North America ...
act call
Theat. 1. Also called act warning. a call or order from the stage manager summoning performers onstage for the beginning of a performance or act. 2. a signal summoning the ...
act curtain
Theat. a curtain for closing the proscenium opening between acts or scenes. Also called act drop, house curtain. * * *
act of faith
an act that demonstrates or tests the strength of a person's convictions, as an important personal sacrifice. Cf. auto-da-fé. * * *
act of God
Law. a direct, sudden, and irresistible action of natural forces such as could not reasonably have been foreseen or prevented, as a flood, hurricane, earthquake, or other natural ...
Act of Parliament
(in Britain) a new law which has been approved by Parliament. After a bill has been passed by the House of Commons and the House of Lords and it has received royal assent, it ...
Act of Parliament clock
also called  tavern clock        weight-driven wall clock with a large wooden, painted or lacquered dial. More correctly, it is called a tavern clock. Clocks of this ...
Act of Parliament clock.
See Parliament clock. * * *
Act of Settlement
(in Britain) an Act of Parliament in 1701, saying that the children of James I’s granddaughter Sophia would be the future kings and queens. The government made this law because ...
Act of Supremacy
(in Britain) an Act of Parliament in 1534 that made King Henry VIII the head of the Church of England. This left the Pope with no power in England. * * *
Act of Toleration
Eng. Hist. the statute (1689) granting religious freedom to dissenting Protestants upon meeting certain conditions. Also called Toleration Act. * * *
Act of Uniformity
Eng. Hist. any of the three statutes (1549, 1559, 1662) regulating public worship services in the Anglican Church, esp. the act of 1662 requiring the use of the Book of Common ...
Act of Union
(in Britain) either of two Acts of Parliament. The first Act of Union, in 1707, officially joined England and Scotland as one kingdom, called Great Britain, ruled by the ...
act of war
an act of aggression by a country against another with which it is nominally at peace. * * *
act warning
Theat. 1. notification from the manager advising the performers of the amount of time left before they must appear onstage. 2. See act call (def. 1). * * *
1. acting. 2. active. 3. actor. 4. actual. * * *
/ak"teuh/, n.pl. (often cap.) official records, as of acts, deeds, proceedings, transactions, or the like. [ < L, neut. pl. of ACTUS, ptp. of agere to do; cf. ACT] * * ...
Acta Sanctorum
/ahk"tah sahngk tawr"oom/ a collection of the biographies of the Christian saints and martyrs, edited by the Bollandists and arranged according to the ecclesiastical calendar. * ...
See act. * * *
—actability, n. /ak"teuh beuhl/, adj. capable of being or suitable for acting. [1840-50; ACT + -ABLE] * * *
/ak tee"euhn/, n. Class. Myth. a hunter who, for having seen Diana bathing, was changed by her into a stag and was torn to pieces by his own hounds. * * * ▪ Greek ...
actg abbrev. acting * * *
acting. * * *
1. Biochem. a polypeptide hormone, produced by the anterior lobe of the pituitary gland, that stimulates the cortex of adrenal glands. 2. Pharm. this substance, extracted from ...
/ak"teuhn/, n. Biochem. a globulin that is present in muscle plasma and that in connection with myosin plays an important role in muscle contraction. [1940-45; perh. ACT + ...
var. of actino- before a vowel: actinism. * * *
—actinally, adv. /ak"teuh nl, ak tuyn"l/, adj. Zool. 1. having tentacles or rays. 2. pertaining to the oral area from which the arms or tentacles radiate. [1857; ACTIN- + -AL1; ...
See actinal. * * *
/ak"ting/, adj. 1. serving temporarily, esp. as a substitute during another's absence; not permanent; temporary: the acting mayor. 2. designed, adapted, or suitable for stage ...
acting area
Theat. the part of a stage used by the actors: Confine the acting area for this scene to downstage. * * *
/ak tin"ee euh/, n., pl. actiniae /-tin"ee ee'/, actinias. a sea anemone, esp. of the genus Actinia. [1740-50; < NL; see ACTIN-, -IA] * * *
/ak tin"ee euhn/, adj. 1. belonging or pertaining to the order or suborder Actiniaria, comprising the sea anemones. n. 2. any sea anemone. [1885-90; < NL Actini(a) ACTINIA + ...
—actinically, adv. /ak tin"ik/, adj. pertaining to actinism. [1835-45; ACTIN- + -IC] * * *
actinic ray
Physics. a ray of light of short wavelengths, as ultraviolet or violet, that produces photochemical effects. [1835-45] * * *
actinic rays
actinic rays n. light rays, esp. the violet and ultraviolet parts of the spectrum, that produce chemical changes, as in photography * * *
See actinic. * * *
actinic ray n. Photochemically active radiation, as of the sun. * * *
/ak"teuh nuyd'/, n. Chem. any element of the actinide series. [1940-45; ACTIN- + -IDE, on the model of LANTHANIDE] * * * Any of the series of 15 consecutive chemical elements in ...
actinide element
▪ chemical element group Introduction       any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers ...
actinide series
Chem. the series of radioactive elements that starts with actinium and ends with lawrencium. [1940-45] * * *
/ak tin"euh fawrm'/, adj. Zool. having a radiate form. [1835-45; ACTIN- + -I- + -FORM] * * *
/ak"teuh nin/, n. Biochem. a contractile protein of muscle. [1970-75; ACTIN + -IN2] * * *
/ak"teuh niz'euhm/, n. the property of radiation by which chemical effects are produced. [1835-45; ACTIN- + -ISM] * * *
/ak tin"ee euhm/, n. Chem. a radioactive silver-white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. Symbol: Ac; at. ...
actinium emanation
Chem. actinon. * * *
actinium series
Chem. the radioactive series that starts with uranium 235 and ends with a stable isotope of lead of mass number 207. [1955-60] * * *       set of unstable heavy nuclei ...
a combining form with the meaning "ray, beam," used in the formation of compound words, with the particular senses "radiation" in the physical sciences (actinometer) and "having ...
—actinobacillotic /ak tin'oh bas'euh lot"ik, ak'teuh noh-/, adj. /ak tin'oh bas'euh loh"sis, ak'teuh noh-/, n. Vet. Pathol. an infectious disease of cattle, domestic animals, ...
/ak tin'oh beuh sil"euhs, ak'teuh noh-/, n., pl. actinobacilli /-sil"uy/. Bacteriol. any of several spherical or rod-shaped, aerobic, parasitic bacteria of the genus ...
—actinochemical /ak tin'oh kem"i keuhl, ak'teuh noh-/, adj. /ak tin'oh kem"euh stree, ak'teuh noh-/, n. the branch of chemistry dealing with actinism; photochemistry. [1835-45; ...
/ak tin'oh derr'meuh tuy"tis, ak'teuh noh-/, n. Pathol. inflammation of the skin caused by sunlight or other radiation. [ACTINO- + DERMATITIS] * * *
/ak tin"euh drohm'/, adj. (of a leaf) palmately veined. Also, actinodromous /ak'teuh nod"reuh meuhs/. [ACTINO- + -DROME] * * *
/ak tin"euh gram'/, n. the record produced by the action of an actinograph. [ACTINO- + -GRAM1] * * *
—actinographic /ak tin'euh graf"ik, ak'teuh noh-/, adj. —actinography /ak'teuh nog"reuh fee/, n. /ak tin"euh graf', -grahf'/, n. a recording actinometer. [1830-40; ACTINO- + ...
/ak"teuh noyd'/, adj. raylike; radiate. [1840-50; ACTIN- + -OID] * * *
—actinolitic /ak tin'l it"ik, ak'teuh nl-/, adj. /ak tin"l uyt', ak"teuh nl-/, n. Mineral. a variety of amphibole, occurring in greenish bladed crystals or in masses. [1825-35; ...
/ak'teuh nol"euh jee/, n. the science that deals with actinism. [1855-60; ACTINO- + -LOGY] * * *
ac·ti·no·mere (ăk-tĭnʹə-mîr') n. One of the segments forming the body of a radially symmetric animal. * * *
—actinometric /ak tin'oh me"trik, ak'teuh noh-/, actinometrical, adj. —actinometry, n. /ak'teuh nom"i teuhr/, n. a device for measuring intensity of radiation, esp. that of ...
See actinometer. * * *
See actinometric. * * *
See actinometric. * * *
—actinomorphy, n. /ak tin'oh mawr"fik, ak'teuh noh-/, adj. 1. Biol. having radial symmetry. 2. Bot. (of certain flowers, as the buttercup) divisible vertically into similar ...
See actinomorphic. * * *
—actinomycetal, adj. /ak tin'oh muy"seez, ak'teuh noh-/, n., pl. actinomyces. Bacteriol. any of several saprophytic, filamentous, anaerobic bacteria of the genus Actinomyces, ...
See actinomycete. * * *
—actinomycetous, adj. /ak tin'oh muy"seet, -muy seet", ak'teuh noh-/, n. Bacteriol. any of several rod-shaped or filamentous, aerobic or anaerobic bacteria of the phylum ...
See actinomycetal. * * *
/ak tin'oh muy"sin, ak'teuh noh-/, n. Pharm. any of a group of related antibiotics derived from several species of streptomyces bacteria, used against susceptible bacteria and ...
actinomycin D
Pharm. dactinomycin. * * *
actinomycin D n. See dactinomycin. * * *
—actinomycotic /ak tin'oh muy kot"ik, ak'teuh noh-/, adj. /ak tin'oh muy koh"sis, ak'teuh noh-/, n. Vet. Pathol., Pathol. an infectious, inflammatory disease caused by ...
See actinomycosis. * * *
▪ protozoan also called  Actinosporean,        any parasitic microorganism of the class Actinomyxidia (Actinosporea), phylum Myxosporidia (Myxospora). It inhabits the ...
/ak"teuh non'/, n. Chem. a chemically inert, gaseous, short-lived isotope of radon that is a member of the actinium series. Symbol: An; at. no.: 86; at. wt.: 219. Also called ...
/ak tin"euh pod', ak"teuh neuh/, n. any protozoan of the subclass Actinopoda, including the heliozoans and radiolarians, having stiff, rodlike, radiating pseudopodia. [ < NL ...
/ak'teuh nop'teuh rij"ee euhn/, adj. 1. belonging or pertaining to the Actinopterygii, a group of bony fishes. n. 2. an actinopterygian fish. [ < NL Actinopterygi(i) (pl.) ...
/ak tin'oh ther"euh pee, ak'teuh noh-/, n. Med. radiotherapy, esp. using ultraviolet rays. [1900-05; ACTINO- + THERAPY] * * *
/ak tin'oh yoo ray"nee euhm, ak'teuh noh-/, n. Chem. See uranium 235. [1925-30; ACTINO- + URANIUM] * * *
/ak tin'euh zoh"euhn, ak'teuh neuh-/, n., adj. Zool. anthozoan. [ACTINO- + -ZO(A) + -AN] * * *
—actionless, adj. /ak"sheuhn/, n. 1. the process or state of acting or of being active: The machine is not in action now. 2. something done or performed; act; deed. 3. an act ...
/ak"sheuhn/, n. U.S. Govt. an independent agency created in 1971 to administer domestic volunteer programs. [named by analogy with the acronymic names of other agencies, but ...
Action figures
➡ toys and games * * *
Action Française
("French Action") Influential right-wing antirepublican group in early 20th-century France, whose views were promoted in a newspaper of the same name. The Action Française ...
action grant
funds awarded by the federal government on a competitive basis to cities that submit plans for urban development and are able to show that such plans have the cooperation and ...
action line
a telephone line maintained by a newspaper, television station, or other medium to provide the public a ready means of expressing complaints or obtaining information about ...
Action Man{™}
n a toy in the form of a man, with different clothes and equipment that can be bought separately. When it was first sold in the 1960s as a doll for boys, Action Man was a ...
action painting
—action painter. 1. (sometimes caps.) Also called tachism. a style of American abstract expressionist painting typified esp. in the works of Jackson Pollack and Willem de ...
action potential
Physiol. the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals. Cf. ...
action replay
Brit. See instant replay. [1970-75] * * *
action reporter
a news reporter who reports to the public on matters of special interest to the consumer. * * *
—actionability, n. —actionably, adv. /ak"sheuh neuh beuhl/, adj. 1. furnishing ground for a lawsuit. 2. liable to a lawsuit. 3. ready to go or be put into action; ready for ...
See actionable. * * *
See action. * * *
See action painting. * * *
action painting n. A style of abstract painting that uses techniques such as the dribbling or splashing of paint to achieve a spontaneous effect.   action painter n. * * *
action potential n. A momentary change in electrical potential on the surface of a nerve or muscle cell that takes place when it is stimulated, especially by the transmission of ...
/ak"tis/, n. Class. Myth. a son of Rhoda and Helius who, when banished from his home for fratricide, fled to Egypt, where he taught astrology. The Colossus of Rhodes was built in ...
—Actian /ak"tee euhn, -shee euhn/, adj. /ak"tee euhm, -shee euhm/, n. a promontory in NW ancient Greece: Antony and Cleopatra were defeated by Octavian and Agrippa in a naval ...
Actium, Battle of
(31 BC) Naval battle off Acarnania, Greece, between Octavian (later Augustus) and Mark Antony. With 500 ships and 70,000 infantry, Antony camped at Actium, between the Ionian ...
Ac·ti·vase (ăkʹtə-vās') A trademark used for a preparation of tissue plasminogen activator. * * *
—activation, n. /ak"teuh vayt'/, v.t., activated, activating. 1. to make active; cause to function or act. 2. Physics. a. to render more reactive; excite: to activate a ...
activated alumina
Chem. alumina in the form of granules having many fine pores, used to adsorb water and various gases. * * *
activated carbon
Chem. a form of carbon having very fine pores: used chiefly for adsorbing gases or solutes, as in various filter systems for purification, deodorization, and decolorization. Also ...
activated mine
a mine with a secondary fuze designed to explode if the mine is tampered with. * * *
activated sludge
sludge (def. 8). * * *
activated-sludge method
▪ sewage treatment       sewage-treatment (sewage system) process in which sludge, the accumulated, bacteria-rich deposits of settling tanks and basins, is seeded into ...
ac·ti·vat·ed charcoal (ăkʹtə-vā'tĭd) n. Highly absorbent carbon obtained by heating granulated charcoal to exhaust contained gases, resulting in a highly porous form with ...
See activate. * * * ▪ psychology also called  arousal        in psychology, the stimulation of the cerebral cortex into a state of general wakefulness, or attention. ...
activation analysis
Chem. a method for the qualitative and quantitative determination of trace amounts of various elements by measuring the characteristic radioactive decay induced by neutron ...
activation energy
Minimum amount of energy (heat, electromagnetic radiation, or electrical energy) required to activate atoms or molecules to a condition in which it is equally likely that they ...
activation analysis n. A method for analyzing a material for its component chemical elements by bombarding it with nuclear particles or gamma rays and identifying the resultant ...
/ak"teuh vay'teuhr/, n. 1. a person or thing that activates. 2. Chem., Biochem. a catalyst. 3. any impurity in a mineral that causes luminescence. Cf. inhibitor (def. 3). 4. ...
—actively, adv. —activeness, n. /ak"tiv/, adj. 1. engaged in action; characterized by energetic work, participation, etc.; busy: an active life. 2. being in a state of ...
active duty
Mil. the status of full-time service: on active duty. Also called active service. * * *
active galactic nucleus
Small region at the centre of a galaxy that emits a prodigious amount of energy in the form of radio, optical, X-ray, or gamma radiation or high-speed particle jets. Many ...
active hydrogen
Chem. See atomic hydrogen. * * *
active immunity
Immunol. immunity in an organism resulting from its own production of antibody or lymphocytes. Cf. passive immunity. [1910-15] * * *
active layer
(in arctic or subarctic regions) the layer of soil, above the permafrost, that thaws during the summer. * * *
active mass
Chem. the effective concentration of a substance. [1905-10] * * *
active reason
Aristotelianism. an activity of intellect, embodying universal truth, potentially present in the mind of every individual, and when present, forming the only immortal part of the ...
active site
Biochem. the part of an enzyme that interacts with the substrate during catalysis. [1960-65] * * *
active sun
Astron. 1. the sun at a maximum of solar activity, occurring every 11 years. 2. solar activity, superimposed on an unchanging background. Cf. quiet sun, solar cycle. [1975-80] * ...
active transport
the movement of ions or molecules across a cellular membrane from a lower to a higher concentration, requiring the consumption of energy. [1960-65] * * *
/ak"tiv may"triks/, adj. of or pertaining to a high-resolution liquid-crystal display (LCD) with high contrast, used esp. for laptop computers. Cf. passive-matrix. [1990-95] * * *
active immunity n. Immunity resulting from the development of antibodies in response to the presence of an antigen, as from vaccination or exposure to an infectious disease. * * *
See active. * * *
See actively. * * *
active site n. The part of an enzyme at which catalysis of the substrate occurs. * * *
active transport n. The movement of a chemical substance through a gradient of concentration or electrical potential in the direction opposite to normal diffusion, requiring the ...
/ak"tiv wair'/ n. sportswear (def. 1). Also, active wear. [ACTIVE + WEAR] * * *
ac·ti·vin (ăkʹtə-vĭn, ăk-tĭvʹĭn) n. A polypeptide growth factor that is synthesized in the pituitary gland and the gonads and stimulates the secretion of follicle ...
/ak"teuh viz'euhm/, n. 1. the doctrine or practice of vigorous action or involvement as a means of achieving political or other goals, sometimes by demonstrations, protests, ...
/ak"teuh vist/, n. 1. an especially active, vigorous advocate of a cause, esp. a political cause. adj. 2. of or pertaining to activism or activists: an activist organization for ...
See activism. * * *
/ak tiv"i tee/, n., pl. activities. 1. the state or quality of being active: There was not much activity in the stock market today. He doesn't have enough physical activity in ...
activity coefficient
Number expressing the ratio of a substance's chemical activity to its molar concentration (see mole). The measured concentration of a substance may not be an accurate indicator ...
activity holidays
➡ holidays and vacations * * *
activity series
activity series Chem. a table of metals, listed in the order of their ability to replace other metals while in solution * * *
—activization, n. /ak"teuh vuyz'/, v.t., activized, activizing. to make active; activate. Also, esp. Brit., activise. [ACTIVE + -IZE] * * *
/ak"toh/; Sp. /ahk"taw/, n., pl. actos /-tohz/; Sp. /-taws/. Southwest U.S. a short, realistic play, usually in Spanish, that dramatizes the social and economic problems of ...
Acto Adicional of 1834
▪ Brazilian law       amendment to the Brazilian (Brazil) constitution of 1824 that abolished some of that charter's extremely centralist and authoritarian aspects. It ...
actof God
act of God n. pl. acts of God A manifestation especially of a violent or destructive natural force, such as a lightning strike or earthquake, that is beyond human power to ...
/ak'teuh muy"euh sin/, n. Biochem. a complex protein, consisting of myosin and actin, that is the major constituent of skeletal muscle and is thought to interact with ATP to ...
/ak"teuhn/, n. Armor. a quilted garment worn under mail in the 13th and 14th centuries; gambeson. Also, ackton, aketon. [1250-1300; ME < AF aketoun, OF a(u)queton < OSp algodon < ...
/ak"teuhn/, n. 1. Lord (John Emerich Edward Dalberg-Acton, 1st Baron), 1834-1902, English historian. 2. a former municipal borough in SE England, now part of the London borough ...
Acton (of Aldenham), John Emerich Edward Dahlberg Acton, 1st Baron
born Jan.10, 1834, Naples, Kingdom of Naples died June 19, 1902, Tegernsee, Bavaria, German Empire English historian. He served in the House of Commons (1859–65). Editor of ...
Acton, John Emerich Edward Dalberg Acton, 1st Baron, 8th Baronet
▪ English historian and moralist Introduction born Jan. 10, 1834, Naples died June 19, 1902, Tegernsee, Bavaria, Ger.  English Liberal historian and moralist, the first great ...
Acton, Sir Harold Mario Mitchell
▪ 1995       British writer and connoisseur (b. July 5, 1904, Villa La Pietra, near Florence, Italy—d. Feb. 27, 1994, Villa La Pietra), was "the consummate aesthete of ...
Acton, Sir John Francis Edward, 6th Baronet
▪ prime minister of the Kingdom of Naples born June 1736, Besançon, Fr. died Aug. 12, 1811, Palermo       commander of the naval forces of Tuscany and then of Naples ...
/ak"teuhr/, n. 1. a person who acts in stage plays, motion pictures, television broadcasts, etc. 2. a person who does something; participant. [1350-1400; ME < L actor, equiv. to ...
/ak"teuhr/, n. Class. Myth. a brother of King Augeas, sometimes believed to be the father, by Molione, of Eurytus and Cteatus. Cf. Moliones. * * *
/ak"teuhr man"euh jeuhr/, n. a leading actor who produces and usually stars in his or her own productions: Sir Henry Irving was one of the first actor-managers. [1860-65] * * *
actor-manager system
Method of theatrical production prevalent in 19th-century England and the U.S. In this system, an actor formed a theatre company, chose the plays he wanted to produce, played the ...
/ak"teuhr proohf'/, adj. Theat. (of a role or script) effective even if poorly acted. [1890-95; ACTOR + -PROOF] * * *

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