| opposite | 1. Placed over against; standing or situated over against or in front; facing; often with to; as, a house opposite to the Exchange. 2. Applied to the other of two things which are entirely different; other; as, the opposite sex; the opposite extreme. 3. Extremely different; inconsistent; contrary; repugnant; antagonistic. "Novels, by which the reader is misled into another sort of pieasure opposite to that which is designed in an epic poem." (Dryden) "Particles of speech have divers, and sometimes almost opposite, significations." (Locke) 4. <botany> Set over against each other, but separated by the whole diameter of the stem, as two leaves at the same node. Placed directly in front of another part or organ, as a stamen which stands before a petal. Origin: F, fr. L. Oppositus, p. P. Of opponere. See Opponent. Source: Websters Dictionary (01 Mar 1998) |
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| oppositifolious | <botany> Placed at the same node with a leaf, but separated from it by the whole diameter of the stem; as, an oppositifolious peduncle. See: Opposite, Folious. Source: Websters Dictionary (01 Mar 1998) |
| opposition | 1. The act of opposing; an attempt to check, restrain, or defeat; resistance. "The counterpoise of so great an opposition." (Shak) "Virtue which breaks through all opposition." (Milton) 2. The state of being placed over against; situation so as to front something else. 3. Repugnance; contrariety of sentiment, interest, or purpose; antipathy. 4. That which opposes; an obstacle; specifically, the aggregate of persons or things opposing; hence, in politics and parliamentary practice, the party opposed to the party in power. 5. <astronomy> The situation of a heavenly body with respect to another when in the part of the heavens directly opposite to it; especially, the position of a planet or satellite when its longitude differs from that of the sun 180 deg; signified by the symbol; as, <Jupiter/ <Sun/, opposition of Jupiter to the sun. 6. <logic> The relation between two propositions when, having the same subject and predicate, they differ in quantity, or in quality, or in both; or between two propositions which have the same matter but a different form. Origin: F, fr. L. Oppositio. See Opposite. Source: Websters Dictionary (01 Mar 1998) |
| oppositional disorder | A mental disorder of childhood or adolescence marked by a pattern of disobedient, negativistic, and provocative opposition to authority figures. (05 Mar 2000) |
| oppositipetalous | <botany> Placed in front of a petal. See: Opposite, and Petal. Source: Websters Dictionary (01 Mar 1998) |
| oppositisepalous | <botany> Placed in front of a sepal. See: Opposite, and Sepal. Source: Websters Dictionary (01 Mar 1998) |
| opposure | Bringing together of tissue during suturing. (05 Mar 2000) |
| oppress | 1. To impose excessive burdens upon; to overload; hence, to treat with unjust rigor or with cruelty. "For thee, oppressed king, am I cast down." (Shak) "Behold the kings of the earth; how they oppress Thy chosen !" (Milton) 2. To ravish; to violate. 3. To put down; to crush out; to suppress. "The mutiny he there hastes to oppress." (Shak) 4. To produce a sensation of weight in (some part of the body); as, my lungs are oppressed by the damp air; excess of food oppresses the stomach. Origin: F. Oppresser, LL. Oppressare, fr. L. Oppressus, p. P. Of opprimere; ob (see Ob-) + premere to press. See Press. Source: Websters Dictionary (01 Mar 1998) |
| oppressure | Oppression. Source: Websters Dictionary (01 Mar 1998) |
| opsin | <protein> General term for the apoproteins of the rhodopsin family. (18 Nov 1997) |
| opsinogen | A substance that stimulates the formation of opsonin, such as the antigen contained in a suspension of bacteria used for immunization. Synonym: opsogen. Origin: opsonin + -gen (05 Mar 2000) |
| opsiometer | An instrument for measuring the limits of distincts vision in different individuals, and thus determiming the proper focal length of a lens for correcting imperfect sight. Origin: Gr. Sight: cf. F. Opsiometre. Source: Websters Dictionary (01 Mar 1998) |
| opsiuria | A more rapid excretion of urine during fasting than after a full meal. Origin: G. Opsi, late, + ouron, urine (05 Mar 2000) |
| opsoclonus | Rapid, irregular, nonrhythmic movements of the eye in horizontal and vertical directions. Origin: G. Ops, opos, eye, + klonos, confused motion (05 Mar 2000) |
| opsogen | A substance that stimulates the formation of opsonin, such as the antigen contained in a suspension of bacteria used for immunization. Synonym: opsogen. Origin: opsonin + -gen (05 Mar 2000) |
| ophthalmitis |
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| ophthalmoblennorrhea |
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| ophthalmocopia |
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| ophthalmodesmitis |
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| ophthalmodiaphanoscope |
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| OP | a physician who specializes in surgery |
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| OP | (computer science) software that controls the execution of computer programs and may provide various services |
| OP | table on which the patient lies during a surgical operation |
| OP | a room in a hospital equipped for the performance of surgical operations |
| OP | a room in a hospital equipped for the performance of surgical operations |
| OP | the activity of operating something (a machine or business etc.) |
| OP | a planned activity involving many people performing various actions |
| OP | a process or series of acts especially of a practical or mechanical nature involved in a particular form of work |
| OP | a medical procedure involving an incision with instruments |
| OP | (mathematics) calculation by mathematical methods |
| OP | activity by a military or naval force (as a maneuver or campaign) |
| OP | a business especially one run on a large scale |