| omeprazole | <drug> A proton pump inhibitor that works by binding to H+/K+ ATPase, an enzyme which is found on the secretory surface of parietal cells. It thereby inhibits the final transport of hydrogen ions (via exchange with K+) into the gastric lumen. (27 Sep 1997) |
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| ominous | Of or pertaining to an omen or to omens; being or exhibiting an omen; significant; portentous; formerly used both in a favorable and unfavorable sense; now chiefly in the latter; foreboding or foreshowing evil; inauspicious; as, an ominous dread. "He had a good ominous name to have made a peace." (Bacon) "In the heathen worship of God, a sacrifice without a heart was accounted ominous." (South) Om"inously, Om"inousness. Origin: L. Ominosus, fr. Omen. See Omen. Source: Websters Dictionary (01 Mar 1998) |
| omission | 1. The act of omitting; neglect or failure to do something required by propriety or duty. "The most natural division of all offenses is into those of omission and those of commission." (Addison) 2. That which is omitted or is left undone. Origin: L. Omissio: cf. F. Omission. See Omit. Source: Websters Dictionary (01 Mar 1998) |
| omit | 1. To let go; to leave unmentioned; not to insert or name; to drop. "These personal comparisons I omit." (Bacon) 2. To pass by; to forbear or fail to perform or to make use of; to leave undone; to neglect. "Her father omitted nothing in her education that might make her the most accomplished woman of her age." (Addison) Origin: L. Omittere, omissum; ob (see Ob- + mittere to cause to go, let go, send. See Mission. Source: Websters Dictionary (01 Mar 1998) |
| ommateal | <zoology> Of or pertaining to an ommateum. Source: Websters Dictionary (01 Mar 1998) |
| ommateum | Origin: NL, fr. Gr, the eye. <zoology> A compound eye, as of insects and crustaceans. Source: Websters Dictionary (01 Mar 1998) |
| ommatidium | A single facet of an invertebrate compound eye. (18 Nov 1997) |
| Ommaya | Ayub, 20th century U.S. Neurosurgeon. See: Ommaya reservoir. (05 Mar 2000) |
| ommaya reservoir | <apparatus> A device with a fluid reservoir implanted under the scalp with a catheter to a ventricle. It allows for medication to be given directly to the CSF and into the brain. (16 Dec 1997) |
| omnifocal lens | A lens for near and distant vision in which the reading portion is a continuously variable curve. (05 Mar 2000) |
| omnigraph | A pantograph. Origin: Omni- + -graph. Source: Websters Dictionary (01 Mar 1998) |
| omnipotence of thought | A childish or magical thought process whereby instantaneous gratification of fantasies and wishes is believed to be imminent. (05 Mar 2000) |
| omniscient | Having universal knowledge; knowing all things; infinitely knowing or wise; as, the omniscient God. Omnis"ciently, "For what can scape the eye Of God all-seeing, or deceive his heart Omniscient?" (Milton) Origin: Omni- + L. Sciens, -entis, p. Pr. Of scire to know: cf. F. Omniscient. See Science. Source: Websters Dictionary (01 Mar 1998) |
| omnivora | <zoology> A group of ungulate mammals including the hog and the hippopotamus. The term is also sometimes applied to the bears, and to certain passerine birds. Origin: NL. See Omnivorous. Source: Websters Dictionary (01 Mar 1998) |
| omnivore | <biology, zoology> An animal that eats all kinds of plants and animals. (09 Oct 1997) |