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Слова на букву oil-pius (15990)

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open union
a labor union that does not impose rigid restrictions on the admission of new members. Cf. closed union. * * *
open universe
Astron. a model of the universe in which the universe expands forever because there is not enough mass to counteract the expansion by means of gravitational attraction. Cf. ...
Open University
Trademark. a largely self-instructional university, founded in England in 1969, offering independent education through such means as television, computers, and mailed course ...
open-air
—open-airish, adj. —open-airishness, n. —open-airness, n. /oh"peuhn air"/, adj. existing in, taking place in, or characteristic of the open air; outdoor: The orchestra gave ...
open-and-shut
/oh"peuhn euhn shut"/, adj. immediately obvious upon consideration; easily decided: an open-and-shut case of murder. [1835-45, Amer.] * * *
open-angle glaucoma
/oh"peuhn ang'geuhl/ Ophthalm. See under glaucoma. * * *
open-cast
/oh"peuhn kast', -kahst'/, adj. Brit. Mining. open-cut. [1705-15] * * *
open-cut
/oh"peuhn kut'/, adj. Mining. noting or pertaining to a type of surface mining in which coal and other flat-lying mineral deposits are removed by the excavation of long, narrow ...
open-door
See open door. * * *
open-end
/oh"peuhn end"/, adj. 1. of, pertaining to, or like an open-end investment company. 2. open-ended (def. 2). [1905-10] * * *
open-end investment company.
See mutual fund. * * *
open-end mortgage
a mortgage agreement against which new sums of money may be borrowed under certain conditions. * * *
open-ended
—open-endedness, n. /oh"peuhn en"did/, adj. 1. not having fixed limits; unrestricted; broad: an open-ended discussion. 2. allowing for future changes, revisions, or additions: ...
open-endedly
See open-ended. * * *
open-endedness
See open-endedly. * * *
open-endinvestment company
open-end investment company n. A mutual fund. * * *
open-endwrench
open-end wrench n. A wrench having fixed, open jaws on one or both ends. * * *
open-eyed
—open-eyedly /oh"peuhn uy"id lee, -uyd"-/, adv. /oh"peuhn uyd"/, adj. 1. having the eyes open. 2. having the eyes wide open, as in wonder. 3. watchful; observant; alert. 4. ...
open-faced
/oh"peuhn fayst"/, adj. 1. having a frank or ingenuous face. 2. Also, open-face. designating an open sandwich. 3. (of a watch) having the dial covered only by the crystal. Cf. ...
open-field system
▪ agriculture       basic community organization of cultivation in European agriculture for 2,000 years or more. Its best-known medieval form consisted of three ...
open-heart surgery
/oh"peuhn hahrt"/ surgery performed on the exposed heart while a heart-lung machine pumps and oxygenates the blood and diverts it from the heart. [1975-80] * * * Any surgical ...
open-hearted
—open-heartedly, adv. —open-heartedness, n. /oh"peuhn hahr"tid/, adj. 1. unreserved, candid, or frank: open-hearted advice. 2. kindly; benevolent: an open-hearted gift to ...
open-hearth
/oh"peuhn hahrth"/, adj. noting, pertaining to, or produced by the open-hearth process. [1880-85] * * *
open-hearth process
a process of steelmaking in which the charge is laid in a furnace (open-hearth furnace) on a shallow hearth and heated directly by burning gas as well as radiatively by the ...
open-heartsurgery
o·pen-heart surgery (ōʹpən-härtʹ) n. Surgery in which the thoracic cavity is opened to expose the heart and the blood is recirculated and oxygenated by a heart-lung ...
open-line
/oh"peuhn luyn'/, adj. (of a radio or TV show) maintaining open telephone lines to permit listeners or viewers to phone a program with comments, questions, requests, etc.; ...
open-market operation
▪ economics       any of the purchases and sales of government securities and sometimes commercial paper by the central banking authority for the purpose of regulating ...
open-minded
—open-mindedly, adv. —open-mindedness, n. /oh"peuhn muyn"did/, adj. 1. having or showing a mind receptive to new ideas or arguments. 2. unprejudiced; unbigoted; ...
open-mindedly
See open-minded. * * *
open-mindedness
See open-mindedly. * * *
open-mouthed
—open-mouthedly /oh"peuhn mow"dhid lee, -mowtht"lee/, adv. —open-mouthedness, n. /oh"peuhn mowdhd", -mowtht"/, adj. 1. having the mouth open. 2. gaping, as with surprise or ...
open-mouthedly
See open-mouthed. * * *
open-mouthedness
See open-mouthedly. * * *
open-pit
/oh"peuhn pit'/, adj. Mining. noting or pertaining to a type of surface mining in which massive, usually metallic mineral deposits are removed by cutting benches in the walls of ...
open-pit mining
open-pit mining [ō′pən pit΄] n. a method of mining, usually for metallic ores, in which the waste and ore are completely removed from the sides and bottom of a pit which ...
open-pollinated
—open pollination. /oh"peuhn pol"euh nay'tid/, adj. Bot. (of a flower) pollinated without human agency. [1920-25] * * *
open-pollination
open-pollination [ō΄pən päl΄ə nā′shən] n. the pollination of open flowers by insects, the wind, etc. without human action * * *
open-reel tape
/oh"peuhn reel'/ audiotape, usually 1/4 in. (64 mm) wide, wound on a single reel and requiring a separate take-up reel for playing or recording. Also called reel-to-reel ...
open-shelf
/oh"peuhn shelf"/, adj. open-stack. [1815-25] * * *
open-sided
/oh"peuhn suy"did/, adj. having a side or sides open. * * *
open-source
☆ open-source [ō′pən sôrs′ ] adj. designating or of software whose code is made public and which is thus available to any programmer to develop and customize * * ...
open-stack
/oh"peuhn stak"/, adj. Library Science. having or being a system of library management in which patrons have direct access to stacks for browsing and selecting books; open-shelf. ...
open-timbered
/oh"peuhn tim"beuhrd/, adj. (of a roof, ceiling, etc.) constructed so that the timbers are exposed. * * *
open-web
/o"peuhn web"/, adj. (of a metal joist or girder) having a web of zigzag or crisscross lacing. [1870-75] * * *
openable
—openability, n. /oh"peuh neuh beuhl/, adj. capable of being opened. [1815-25; OPEN + -ABLE] * * *
openadmissions
open admissions pl.n. (used with a sing. or pl. verb) A policy that permits enrollment of a student in a college or university without regard to academic qualifications. Also ...
openadoption
open adoption n. An adoption arrangement in which contact between the adoptive and biological parents is allowed or maintained. * * *
opencast mining
➡ strip mining * * *        surface mining (q.v.) to obtain minerals other than coal. * * *
openchain
open chain n. An arrangement of atoms that does not form a ring, as in silicon compounds and various carbon compounds, such as aliphatic hydrocarbons. * * *
opencity
open city n. A city that is declared demilitarized during a war, thus gaining immunity from attack under international law. * * *
openclassroom
open classroom n. 1. A system of elementary education in which instruction and activities are informally structured, flexible, and individualized. 2. A school or classroom in ...
opendoor
open door n. 1. Unhindered opportunity; free access. 2. Admission to all on equal terms. 3. A policy whereby a nation trades with all other nations on equal ...
openenrollment
open enrollment n. See open admissions. * * *
opener
/oh"peuh neuhr/, n. 1. a person or thing that opens. 2. a device for opening sealed containers: can opener. 3. the first of several theatrical numbers, variety acts, sports ...
openhanded
—openhandedly, adv. —openhandedness, n. /oh"peuhn han"did/, adj. generous; liberal: openhanded hospitality. [1595-1605; open hand + -ED3] Syn. magnanimous, bountiful, lavish, ...
openhandedly
See openhanded. * * *
openhandedness
See openhandedly. * * *
openhearted
openhearted [o′pənhärt΄id] adj. 1. not reserved; frank; candid 2. kindly; generous openheartedly adv. openheartedness n. * * * o·pen·heart·ed ...
openheartedly
See openhearted. * * *
openheartedness
See openheartedly. * * *
openhouse
open house n. 1. A social event in which hospitality is extended to all. 2. An occasion when a school or institution is open for visiting and observation by the public. 3. a. A ...
opening
/oh"peuh ning/, n. 1. an act or instance of making or becoming open. 2. the act of a person or thing that opens. 3. an unobstructed or unoccupied space or place. 4. a void in ...
opening hours
➡ licensing laws * * *
opening night
the first performance of a theatrical attraction, taking place in the evening: The audience was full of celebrities on opening night. Also called first night. [1805-15] * * *
openingtransaction
opening transaction n. 1. The first transaction for a security during a trading day. 2. An option order that establishes a new investment position or increases the size of an ...
openinterval
open interval n. A set of numbers consisting of all the numbers between a pair of given numbers but not including the endpoints. * * *
openletter
open letter n. A published letter on a subject of general interest, addressed to a person but intended for general readership. * * *
openloop
open loop n. Engineering A control system that does not have a feedback loop and thus is not self-correcting. * * *
openly
See open. * * *
openmarket
open market n. A freely competitive market operating without restrictions. * * *
openmarriage
open marriage n. A marriage in which the partners agree that each is free to engage in extramarital relationships. * * *
openness
See openly. * * *
openseason
open season n. 1. The period during which it is legal to hunt or catch game or fish. 2. Informal. A time of unrestrained harassment, criticism, or attack: “By 1950 it was open ...
opensecret
open secret n. Something supposedly secret but in fact generally known. * * *
opensentence
open sentence n. Mathematics An expression that contains at least one unknown quantity and becomes true or false when a test value is substituted for the unknown. * * *
opensesame
open sesame n. A simple, trusty means of attaining a goal.   [From the magical formula Open Sesame used by Ali Baba in the Arabian Nights to open the door of the robbers' ...
openshop
open shop n. A business or factory in which workers are employed without regard to union membership. * * *
openstock
open stock n. Merchandise kept in stock so as to enable customers to replace or supplement articles, such as dishes, purchased in sets. * * *
openuniverse
open universe n. A model of the universe in which there is insufficient matter, and thus insufficient gravitational force, to halt the expansion initiated by the big bang. * * *
openwork
/oh"peuhn werrk'/, n. any kind of work, esp. ornamental, as of embroidery, lace, metal, stone, or wood, having a latticelike nature or showing openings through its ...
OPer.
Old Persian. * * *
opera
opera1 /op"euhr euh, op"reuh/, n. 1. an extended dramatic composition, in which all parts are sung to instrumental accompaniment, that usually includes arias, choruses, and ...
opéra bouffe
/op"euhr euh boohf", op"reuh/; Fr. /aw pay rddann boohf"/, pl. opéra bouffes, opéras bouffe, Fr. opéras bouffes /aw pay rddann boohf"/. a comic opera, esp. of farcical ...
opera buffa
/op"euhr euh booh"feuh, op"reuh/; It. /aw"pe rddah boohf"fah/, pl. opera buffas, operas buffa, It. opere buffe /aw"pe rdde boohf"fe/. 1. an Italian farcical comic opera ...
opéra comique
/op"euhr euh ko meek", op"reuh/; Fr. /aw pay rddann kaw meek"/, pl. opéra comiques, opéras comique, Fr. operas comiques /aw pay rddann kaw meek"/. See comic opera. [1735-45; < ...
opera glasses
a small, low-power pair of binoculars for use at plays, concerts, and the like. Also, opera glass. [1730-40] * * *
opera hat
a man's tall, collapsible top hat, held open or in shape by springs and usually covered with a black, silky fabric. Also called gibus. Cf. beaver1 (def. 4), silk hat, top ...
opera house
1. a theater devoted chiefly to operas. 2. Older Use. a theater, esp. a large, ornate one. [1710-20] * * *
opera seria
/op"euhr euh sear"ee euh, op"reuh/; It. /aw"pe rddah se"rddyah/, pl. opera serias, operas seria, It. opere serie /aw"pe rdde se"rddye/. Italian dramatic opera of the 18th century ...
opera window
a narrow, fixed window on each side of the rear passenger compartment of an automobile. [1970-75] * * *
opéra-comique
▪ music       French form of opera in which spoken dialogue alternates with self-contained musical numbers. The earliest examples of opéra-comique were satiric comedies ...
operability
See operable. * * *
operable
—operability, n. —operably, adv. /op"euhr euh beuhl, op"reuh-/, adj. 1. that can be treated by a surgical operation. Cf. inoperable (def. 2). 2. capable of being put into ...
operably
See operability. * * *
opérabouffe
o·pé·ra bouffe (ŏpʹər-ə bo͞ofʹ, ŏpʹrə, ô-pā-rä bo͞ofʹ) n. A comic, often farcical opera.   [French, from Italian opera buffa. See opera buffa.] * * *
operabuffa
o·pe·ra buf·fa (ŏpʹər-ə bo͞oʹfə, ŏpʹrə, ōʹpĕ-rä bo͞ofʹfä) n. An Italian comic opera of the 18th century.   [Italian : opera, opera + buffa, feminine of ...
opéracomique
o·pé·ra co·mique (ŏpʹər-ə kŏ-mēkʹ, ŏpʹrə, ô-pā-rä kô-mēkʹ) n. A French comic opera.   [French : opéra, opera + comique, comic.] * * *
operaglass
op·er·a glass (ŏpʹər-ə, ŏpʹrə) n. A pair of small, low-powered binoculars for use especially at a theatrical performance. Often used in the plural. * * *
operagoer
/op"euhr euh goh'euhr, op"reuh-/, n. a person who attends opera performances. [1840-50; OPERA1 + GOER] * * *
operahouse
opera house n. A theater designed chiefly for the performance of operas. * * *
operand
/op"euh rand'/, n. Math. a quantity upon which a mathematical operation is performed. [1885-90; < LL operandum, ger. of operari; see OPERATE] * * *
operant
/op"euhr euhnt/, adj. 1. operating; producing effects. n. 2. a person or thing that operates. [1595-1605; < LL operant- (s. of operans, prp. of operari; see OPERATE); see -ANT] * ...
operant conditioning
conditioning (def. 1). [1940-45] * * *
operantconditioning
operant conditioning n. Psychology A process of behavior modification in which the likelihood of a specific behavior is increased or decreased through positive or negative ...
operantly
See operant. * * *
operate
—operatable, adj. /op"euh rayt'/, v., operated, operating. v.i. 1. to work, perform, or function, as a machine does: This engine does not operate properly. 2. to work or use a ...
operatic
—operatically, adv. /op'euh rat"ik/, adj. 1. of or pertaining to opera: operatic music. 2. resembling or suitable for opera: a voice of operatic caliber. n. 3. Usually, ...
operatically
See operatic. * * *
operatics
op·er·at·ics (ŏp'ə-rătʹĭks) n. (used with a sing. or pl. verb) Exaggerated behavior of a type associated with grand opera; histrionics. * * *
operating
/op"euh ray'ting/, adj. 1. used or engaged in performing operations: an operating surgeon. 2. of, for, or pertaining to operations: an operating budget. 3. of or pertaining to ...
operating income
revenue from business operations after operating expenses are deducted from gross income. Also called operations income. * * *
operating room
a specially equipped room, usually in a hospital, where surgical procedures are performed. Abbr.: OR [1885-90] * * *
operating system
Computers. the collection of software that directs a computer's operations, controlling and scheduling the execution of other programs, and managing storage, input/output, and ...
operating system (OS)
Software that controls the operation of a computer, directs the input and output of data, keeps track of files, and controls the processing of computer programs. Its roles ...
operatingroom
op·er·at·ing room (ŏpʹə-rā'tĭng) PhotoDisc, Inc. n. Abbr. OR A room equipped for performing surgical operations. * * *
operatingsystem
operating system n. Software designed to control the hardware of a specific data-processing system in order to allow users and application programs to make use of it. * * *
operation
/op'euh ray"sheuhn/, n. 1. an act or instance, process, or manner of functioning or operating. 2. the state of being operative (usually prec. by in or into): a rule no longer in ...
Operation Desert Shield
➡ Desert Shield * * *
Operation Desert Storm
➡ Desert Storm * * *
Operation Drake
a series of scientific and other projects in 16 countries involving 400 young people from 27 countries and a British sailing ship, Eye of the Wind, as a floating base. It was ...
operational
—operationally, adv. /op'euh ray"sheuh nl/, adj. 1. able to function or be used; functional: How soon will the new factory be operational? 2. Mil. a. of, pertaining to, or ...
operational amplifier
Electronics. a high-gain, high-input impedance amplifier, usually an integrated circuit, that can perform mathematical operations when suitably wired. [1945-50] * * *
operational calculus
Math. a method for solving a differential equation by treating differential operators as ordinary algebraic quantities, thus obtaining a simpler problem. * * *
operationalism
—operationalist, n. —operationalistic, adj. /op'euh ray"sheuh nl iz'euhm/, n. Philos. the doctrine that the meaning of a scientific term, concept, or proposition consists of ...
operationalist
See operationalism. * * *
operationalize
operationalize [äp΄ə rā′shə nəl īz΄] vt. operationalized, operationalizing to make operational; put into operation operationalization n. * * *
operationally
See operational. * * *
operations
(as used in expressions) operations research operations management vector operations * * *
operations income.
See operating income. * * *
operations research
the analysis, usually involving mathematical treatment, of a process, problem, or operation to determine its purpose and effectiveness and to gain maximum efficiency. [1940-45, ...
operationsresearch
operations research n. Mathematical or scientific analysis of a process or operation, used in making decisions. * * *
operative
—operatively, adv. —operativeness, operativity /op'euhr euh tiv"i tee/, n. /op"euhr euh tiv, op"reuh tiv, op"euh ray'tiv/, n. 1. a person engaged, employed, or skilled in ...
operatively
See operative. * * *
operator
/op"euh ray'teuhr/, n. 1. a person who operates a machine, apparatus, or the like: a telegraph operator. 2. a person who operates a telephone switchboard, esp. for a telephone ...
operatory
/op"euhr euh tawr'ee, -tohr'ee/, n., pl. operatories, adj. n. 1. a room or other area with special equipment and facilities, as for dental surgery, scientific experiments, or the ...
opercle
/oh"peuhr keuhl/, n. an operculum, esp. the posterior bone of the operculum of a fish. [1590-1600; < L operculum cover. See OPERCULUM, -CLE2] * * *
opercular
opercular [ō pʉr′kyo͞o lər, ō pʉr′kyələr] adj. of, or having the nature of, an operculum * * * See operculum. * * *
opercularly
See opercular. * * *
operculate
/oh perr"kyeuh lit, -layt'/, adj. having an operculum. Also, operculated. [1765-75; < L opercul(um) cover (see OPERCULUM) + -ATE1] * * *
operculum
—opercular, adj. /oh perr"kyeuh leuhm/, n., pl. opercula /-leuh/, operculums. 1. Bot., Zool. a part or organ serving as a lid or cover, as a covering flap on a seed vessel. 2. ...
opere citato
/oh"pe rdde' ki tah"toh/; Eng. /op"euh ree' suy tay"toh, si tah"toh/, Latin. See op. cit. * * *
operetta
—operettist, n. /op'euh ret"euh/, n. a short opera, usually of a light and amusing character. [1760-70; < It, dim. of opera OPERA1] * * * Musical drama similar to opera, ...
operon
/op"euh ron'/, n. Genetics. a set of two or more adjacent cistrons whose transcription is under the coordinated control of a promoter, an operator, and a regulator ...
operose
—operosely, adv. —operoseness, n. /op"euh rohs'/, adj. 1. industrious, as a person. 2. done with or involving much labor. [1660-70; < L operosus busy, active, equiv. to oper- ...
operosely
See operose. * * *
operoseness
See operosely. * * *
OPers
Old Persian. * * *
Opet
Ancient Egyptian festival of the New Year. In the celebration of Opet, statues of Amon and Mut and their son Khons were carried down the Nile on barges in a ritual journey from ...
Ophelia
/oh feel"yeuh/, n. a female given name. * * *
Opheltes
/euh fel"teez/, n. Class. Myth. the son of King Lycurgus of Nemea who was killed in infancy by a serpent and in whose memory the Nemean games were held. Also called Archemorus. * ...
ophicleide
—ophicleidean, adj. /of"i kluyd'/, n. a musical wind instrument, a development of the old wooden serpent, consisting of a conical metal tube bent double. [1825-35; < F ...
ophidian
/oh fid"ee euhn/, adj. 1. belonging or pertaining to the suborder Ophidia (Serpentes), comprising the snakes. n. 2. a snake. [1820-30; < NL Ophidi(a) (pl.) name of the suborder ( ...
ophidiid
/oh fid"ee id, of'i duy"id, oh'fi-/, n. 1. any fish of the family Ophidiidae, comprising the cusk-eels. adj. 2. belonging or pertaining to the family Ophidiidae. [ < NL ...
Ophioglossaceae
▪ fern family  only family in the fern order Ophioglossales, a primitive group of ferns. The family contains four genera and about 80 species. Its members are characterized ...
ophiolatry
—ophiolater, n. —ophiolatrous, adj. /of'ee ol"euh tree, oh'fee-/, n. the worship of snakes. [1860-65; < Gk óphi(s) snake + (ID)OLATRY] * * *
ophiolite
/of"ee euh luyt', oh"fee-/, n. Geol. an assemblage of mafic igneous rocks representing remnants of former oceanic crust. [1840-50; < Gk óphi(s) snake + -O- + -LITE; cf. ...
ophiological
See ophiology. * * *
ophiologist
See ophiological. * * *
ophiology
—ophiological /of'ee euh loj"i keuhl, oh'fee-/, ophiologic, adj. —ophiologist, n. /of'ee ol"euh jee, oh'fee-/, n. the branch of herpetology dealing with snakes. [1810-20; < ...
ophiophagous
oph·i·oph·a·gous (ŏf'ē-ŏfʹə-gəs, ō'fē-) adj. Feeding on snakes.   [From Greek ophiophagos: ophis, snake + -phagos, -phagous.] * * *
Ophir
/oh"feuhr/, n. a country of uncertain location, possibly southern Arabia or the eastern coast of Africa, from which gold and precious stones and trees were brought for Solomon. I ...
ophite
—ophitic /oh fit"ik/, adj. /of"uyt, oh"fuyt/, n. Petrol. a diabase in which elongate crystals of plagioclase are embedded in pyroxene. [1350-1400; ME ophites < L ophites ...
ophitic
ophitic [ō fit′ik] adj. 〚< L ophites < Gr ophitēs (lithos), snake (stone) < ophis, a snake (see OPHIOLATRY) + -IC〛 designating a texture of igneous rock, esp. diabase, in ...
Ophiuchus
/of'ee yooh"keuhs, oh'fee-/, n., gen. Ophiuchi /-kuy/. Astron. the Serpent Bearer, a constellation on the celestial equator between Libra and Aquila. * * *
ophiuroid
/of'ee yoor"oyd, oh'fee-/, n. 1. any echinoderm of the subclass Ophiuroidea, including brittle stars, basket stars, and others, characterized by elongate arms radiating from the ...
Ophrys
▪ genus of orchids       genus of orchids, family Orchidaceae, containing approximately 30 species of plants native to Eurasia and North Africa. All have ...
ophthal.
1. ophthalmologist. 2. ophthalmology. * * *
ophthalm-
var. of ophthalmo- before a vowel: ophthalmitis. * * *
ophthalm.
ophthalmology. Also, ophthalmol. * * *
ophthalmia
—ophthalmiac /of thal"mee ak', op-/, n. /of thal"mee euh, op-/, n. inflammation of the eye, esp. of its membranes or external structures. [1350-1400; < LL < Gk ophthalmía, ...
ophthalmia neonatorum
/nee'euh neuh tawr"euhm, -tohr"-/, Pathol. inflammation of the eyes of a newborn child due to an infectious disease, as gonorrhea, contracted during birth from the infected ...
ophthalmic
/of thal"mik, op-/, adj. of or pertaining to the eye; ocular. [1595-1605; < L ophthalmicus < Gk ophthalmikós, equiv. to ophthalm(ós) eye + -ikos -IC] * * *
ophthalmitis
—ophthalmitic /of'thal mit"ik, -theuhl-, op'-/, adj. /of'thal muy"tis, -theuhl-, op'-/, n. Ophthalm. ophthalmia. [1815-25; < NL; see OPHTHALM-, -ITIS] * * *
ophthalmo-
a combining form meaning "eye," used in the formation of compound words: ophthalmology. Also, esp. before a vowel, ophthalm-. [ < Gk, comb. form of ophthalmós] * * *
ophthalmodynamometer
/of thal'moh duy'neuh mom"i teuhr, -din'euh-, op-/, n. 1. a device for measuring the blood pressure of the retinal blood vessels. 2. a device for determining the nearest point of ...
ophthalmologic
See ophthalmology. * * *
ophthalmological
See ophthalmologic. * * *
ophthalmologically
See ophthalmologic. * * *
ophthalmologist
/of'theuhl mol"euh jist, -theuh-, -thal-, op'-/, n. a doctor of medicine specializing in ophthalmology. [1825-35; OPHTHALMO- + -LOG(Y) + -IST] Syn. See eye doctor. * * *
ophthalmology
—ophthalmological /of thal'meuh loj"i keuhl, op-/, ophthalmologic, adj. /of'theuhl mol"euh jee, -theuh-, -thal-, op'-/, n. the branch of medical science dealing with the ...
ophthalmometer
—ophthalmometric /of thal'meuh me"trik, op-/, ophthalmometrical, adj. —ophthalmometry, n. /of'theuhl mom"i teuhr, -theuh-, -thal-, op'-/, n. an instrument for measuring the ...
ophthalmoplegia
▪ eye disorder also called  extraocular muscle palsy     paralysis of the extraocular muscles (muscle) that control the movements of the eye (eye, human). Ophthalmoplegia ...
ophthalmoscope
—ophthalmoscopic /of thal'meuh skop"ik, op-/, ophthalmoscopical, adj. /of thal"meuh skohp', op-/, n. an instrument for viewing the interior of the eye or examining the ...
ophthalmoscopic
See ophthalmoscope. * * *
ophthalmoscopical
See ophthalmoscopic. * * *
ophthalmoscopy
—ophthalmoscopist, n. /of'thal mos"keuh pee, -theuhl-, op'-/, n., pl. ophthalmoscopies. the use of or technique of using an ophthalmoscope. [1720-30; OPHTHALMO- + -SCOPY] * * *
Ophüls
/oh"feuhls/; Ger. /aw"fyuuls/, n. Max /maks/; Ger. /mahks/, (Max Oppenheimer), 1902-57, German film director, in Germany, France, and the U.S. * * *
Ophüls, Max
orig. Max Oppenheimer born May 6, 1902, Saarbrücken, Ger. died March 26, 1957, Hamburg, W.Ger. German film director. An actor, stage director, and producer in Germany and ...
opi
See epi. * * *
opiate
n., adj. /oh"pee it, -ayt'/; v. /oh"pee ayt'/, n., adj., v., opiated, opiating. n. 1. a drug containing opium or its derivatives, used in medicine for inducing sleep and ...
opiatic
/oh'pee at"ik/, adj. of, pertaining to, or resembling opiates. [1670-80; OPIATE + -IC] * * *
Opie, Eugene Lindsay
born July 5, 1873, Staunton, Va., U.S. died March 12, 1971, Bryn Mawr, Pa. U.S. pathologist. He received his M.D. from Johns Hopkins University. Early in his career, he ...
Opie, John
▪ British painter born May 1761, St. Agnes, Cornwall, Eng. died April 9, 1807, London  English portrait and historical painter popular in England during the late 18th ...
Öpik, Ernest Julius
▪ Estonian astronomer born Oct. 23, 1893, Port-Kunda, Estonia, Russian Empire died November 1985       Estonian astronomer best known for his studies of meteors and ...
opine
/oh puyn"/, v.t., v.i., opined, opining. to hold or express an opinion. [1575-85; < L opinari to think, deem] Syn. say, suggest, allow, guess, imagine. * * *
opinicus
/oh pin"i keuhs/, n., pl. opinicuses. a heraldic monster having the head, neck, and wings of an eagle, the body of a lion, and the tail of a bear. [1770-80; orig. uncert.] * * *
opinion
/euh pin"yeuhn/, n. 1. a belief or judgment that rests on grounds insufficient to produce complete certainty. 2. a personal view, attitude, or appraisal. 3. the formal expression ...
opinionated
—opinionatedly, adv. —opinionatedness, n. /euh pin"yeuh nay'tid/, adj. obstinate or conceited with regard to the merit of one's own opinions; conceitedly ...
opinionatedly
See opinionated. * * *
opinionatedness
See opinionatedly. * * *
opinionative
—opinionatively, adv. —opinionativeness, n. /euh pin"yeuh nay'tiv/, adj. 1. of, pertaining to, or of the nature of opinion. 2. opinionated. [1540-50; OPINION + -ATIVE] * * *
opinionatively
See opinionative. * * *
opinioned
/euh pin"yeuhnd/, adj. 1. having an opinion, esp. of a specified kind. 2. obstinate or dogmatic in one's opinions; opinionated. [1575-85; OPINION + -ED3] * * *
opioid
/oh"pee oyd'/, n. Biochem, Pharm. 1. any opiumlike substance. 2. any of a group of natural substances, as the endorphins, produced by the body in increased amounts in response to ...
opistho-
a combining form meaning "back," "behind," "rear," used in the formation of compound words: opisthograph. [ < Gk, comb. form of ópisthen behind, at the back] * * *
opisthobranch
/euh pis"theuh brangk'/, n. 1. any gastropod mollusk of the order Opisthobranchia, as the sea slugs, sea butterflies, and sea hares, characterized by a vestigial or absent mantle ...
opisthodomos
/op'is thod"euh meuhs, -mos'/, n., pl. opisthodomoses. 1. Also called posticum. a small room in the cella of a classical temple, as for a treasury. 2. epinaos. [1690-1700; < Gk ...
opisthognathism
See opisthognathous. * * *
opisthognathous
—opisthognathism, n. /op'is thog"neuh theuhs/, adj. Zool. having receding jaws. [1860-65; OPISTHO- + -GNATHOUS] * * *
opisthograph
/euh pis"theuh graf', -grahf'/, n. a manuscript, parchment, or book having writing on both sides of the leaves. Cf. anopisthograph. [1615-25; < L opisthographus < Gk ...
Opitz, Martin
▪ German poet in full  Martin Opitz von Boberfeld  born Dec. 23, 1597, Bunzlau, Silesia [now Bolesławiec, Pol.] died Aug. 20, 1639, Danzig [now Gdańsk, ...
opium
/oh"pee euhm/, n. 1. the dried, condensed juice of a poppy, Papaver somniferum, that has a narcotic, soporific, analgesic, and astringent effect and contains morphine, codeine, ...
opium poppy
a Eurasian poppy, Papaver somniferum, having white, pink, red, or purple flowers, cultivated as the source of opium, for its oily seeds, and as an ornamental. [1860-65] * * ...
opium trade
▪ British and Chinese history       in Chinese history, the traffic that developed in the 18th and 19th centuries in which Western nations, mostly Great Britain, ...
Opium War
a war between Great Britain and China that began in 1839 as a conflict over the opium trade and ended in 1842 with the Chinese cession of Hong Kong to the British, the opening of ...
Opium Wars
Two trading wars of the mid-19th century in China. The first (1839–42 was between China and Britain, and the second (1856–60; also called the Arrow War or Anglo-French War) ...
opiumism
/oh"pee euh miz'euhm/, n. 1. the addictive use of opium as a stimulant or intoxicant. 2. the pathological condition caused by the addictive use of opium. [OPIUM + -ISM] * * *
opiumpoppy
opium poppy n. An annual plant (Papaver somniferum) native to Turkey and adjacent areas, having grayish-green leaves and variously colored flowers. * * *
OPM
1. Office of Personnel Management. 2. operations per minute. 3. Slang. other people's money. * * *
Opole
O·po·le (ô-pôʹlə) A city of southern Poland on the Oder River southeast of Wroclaw. Originally a Slavic settlement, it passed to Prussia in 1742 and was assigned to ...
Opolskie
▪ province, Poland Introduction Polish  Województwo Opolskie        województwo (province), southern Poland. It is bordered by the provinces of Wielkopolskie and ...
Oporto
/oh pawr"toh, oh pohr"-/, n. a port in NW Portugal, near the mouth of the Douro River. 300,925. Portuguese, Pôrto. * * *
opossum
/euh pos"euhm, pos"euhm/, n., pl. opossums, (esp. collectively) opossum. 1. a prehensile-tailed marsupial, Didelphis virginiana, of the eastern U.S., the female having an ...
opossum shrimp
any small, shrimplike crustacean of the order Mysidacea, the females of which carry their eggs in a pouch between the legs. [1835-45] * * * ▪ crustacean also called  possum ...
opossumshrimp
opossum shrimp n. See mysid. * * *
opotherapy
/op'euh ther"euh pee/, n. organotherapy. [1895-1900; < Gk opó(s) juice + THERAPY] * * *
opp
opp abbrev. 1. opposed 2. opposite * * *
Opp.
opuses; opera. * * *
opp.
1. opposed. 2. opposite. * * *
Oppel, Albert
▪ German geologist and paleontologist born Dec. 19, 1831, Hohenheim, Württemberg died Dec. 22, 1865, Munich       German geologist and paleontologist, who was one of ...
Oppen, George
▪ American poet and political activist born April 24, 1908, New Rochelle, N.Y., U.S. died July 7, 1984, Sunnyvale, Calif.       American poet and political activist, ...
Oppenheim
/op"euhn huym'/, n. E(dward) Phillips, 1866-1946, English novelist. * * *
Oppenheim, E. Phillips
▪ British author in full  Edward Phillips Oppenheim   born Oct. 22, 1866, London, Eng. died Feb. 3, 1946, St. Peter Port, Guernsey, Channel Islands, ...
Oppenheim, Lassa Francis Lawrence
▪ German jurist born March 30, 1858, Windecken, near Frankfurt am Main died Oct. 7, 1919, Cambridge, Cambridgeshire, Eng.       German jurist and teacher of law who was ...
Oppenheimer
/op"euhn huy'meuhr/, n. J(ulius) Robert, 1904-67, U.S. nuclear physicist. * * *
Oppenheimer, Harry Frederick
▪ 2001       South African businessman (b. Oct. 28, 1908, Kimberley, S.Af.—d. Aug. 19, 2000, Johannesburg, S.Af.), as the enormously wealthy chairman of the Anglo ...
Oppenheimer, J(ulius) Robert
born , April 22, 1904, New York, N.Y., U.S. died Feb. 18, 1967, Princeton, N.J. U.S. theoretical physicist. He graduated from Harvard University, did research at Cambridge ...
Oppenheimer, J(ulius)Robert
Op·pen·hei·mer (ŏpʹən-hī'mər), J(ulius) Robert. 1902-1967. American physicist who directed the Los Alamos, New Mexico, laboratory during the development of the first ...
Oppenheimer, J. Robert
▪ American physicist in full  Julius Robert Oppenheimer   born , April 22, 1904, New York, New York, U.S. died February 18, 1967, Princeton, New Jersey  American ...
Oppenheimer, Sir Ernest
▪ South African industrialist born May 22, 1880, Friedberg, Hesse-Nassau, Ger. died Nov. 25, 1957, Johannesburg, S.Af.  German-born industrialist, financier, and one of the ...
Oppenheimer, Sir Philip Jack
▪ 1996       British entrepreneur and chairman, 1948-93, of the De Beers Mining Co.'s international diamond-marketing cartel (b. Oct. 29, 1911—d. Oct. 8, 1995). * * *
Opperman, Sir Hubert Ferdinand
▪ 1997       ("OPPY"), Australian cyclist and politician (b. May 29, 1904, Rochester, Victoria, Australia—d. April 18, 1996, Melbourne, Australia), dominated ...
oppidan
/op"i deuhn/, adj. 1. of a town; urban. n. 2. a townsman. [1530-40; < L oppidanus, equiv. to oppid(um) town + -anus -AN] * * *
oppilate
—oppilation, n. /op"euh layt'/, v.t., oppilated, oppilating. to stop up; fill with obstructing matter; obstruct. [1540-50; < L oppilatus (ptp. of oppilare to stop up), equiv. ...
opponency
/euh poh"neuhn see/, n. 1. an act or instance of opposing. 2. the state of being an opponent. [1720-30; OPPON(ENT) + -ENCY] * * *
opponent
/euh poh"neuhnt/, n. 1. a person who is on an opposing side in a game, contest, controversy, or the like; adversary. adj. 2. being opposite, as in position. 3. opposing; adverse; ...
opportune
—opportunely, adv. —opportuneness, n. /op'euhr toohn", -tyoohn"/, adj. 1. appropriate, favorable, or suitable: an opportune phrase for the occasion. 2. occurring or coming at ...
opportunely
See opportune. * * *
opportuneness
See opportunely. * * *
opportunism
—opportunist, n. /op'euhr tooh"niz euhm, -tyooh"-/, n. 1. the policy or practice, as in politics, business, or one's personal affairs, of adapting actions, decisions, etc., to ...
opportunist
op·por·tun·ist (ŏp'ər-to͞oʹnĭst, -tyo͞oʹ-) n. One who takes advantage of any opportunity to achieve an end, often with no regard for principles or ...
opportunistic
—opportunistically, adv. /op'euhr tooh nis"tik, -tyooh-/, adj. 1. adhering to a policy of opportunism; practicing opportunism. 2. Pathol. a. (of a microorganism) causing ...
opportunisticinfection
opportunistic infection n. An infection by a microorganism that normally does not cause disease but becomes pathogenic when the body's immune system is impaired and unable to ...
opportunity
/op'euhr tooh"ni tee, -tyooh"-/, n., pl. opportunities. 1. an appropriate or favorable time or occasion: Their meeting afforded an opportunity to exchange views. 2. a situation ...
opportunity cost
In economic terms, the opportunities forgone in the choice of one expenditure over others. For a consumer with a fixed income, the opportunity cost of buying a new dishwasher ...
opposability
See opposable. * * *
opposable
—opposability, n. /euh poh"zeuh beuhl/, adj. 1. capable of being placed opposite to something else: the opposable thumb of primates. 2. capable of being resisted, fought, or ...
oppose
—opposer, n. —opposingly, adv. /euh pohz"/, v., opposed, opposing. v.t. 1. to act against or provide resistance to; combat. 2. to stand in the way of; hinder; obstruct. 3. to ...
opposed-piston engine
/euh pohzd"pis"teuhn/ a reciprocating engine, as a diesel engine, in which each cylinder has two pistons that move simultaneously away from or toward the center. Also called ...
opposeless
/euh pohz"lis/, adj. Archaic. tolerating no opposition or resistance; irresistible. [1595-1605; OPPOSE + -LESS] * * *
opposite
—oppositely, adv. —oppositeness, n. /op"euh zit, -sit/, adj. 1. situated, placed, or lying face to face with something else or each other, or in corresponding positions with ...
opposite number
counterpart; equivalent: New members with an interest in folk art will find their opposite numbers in the association's directory. [1905-10] * * *
opposite prompt
Chiefly Brit. Theat. the offstage area to the right as one faces the audience. Abbr.: O.P. Also, opposite prompt side. * * *
opposite-field
See opposite field. * * *

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