| opioid partial agonist | <pharmacology> A compound that has an affinity for and stimulates physiologic activity at the same cell receptors as opioid agonists but that produces only a partial (i.e., submaximal) bodily response. (16 Dec 1997) |
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| opioid peptides | The endogenous peptides with opiate-like activity. The three major classes currently recognised are the enkephalins, the dynorphins, and the endorphins. Each of these families derives from different precursors, proenkephalin, prodynorphin, and pro-opiomelanocortin, respectively. There are also at least three classes of opioid receptors, but the peptide families do not map to the receptors in a simple way. (12 Dec 1998) |
| opioid receptor | <pharmacology> A membrane protein, widely distributed in animal cells, but especially in the brain (enkephalin receptors) and gut. The natural ligands are the opiate peptide neurotransmitters, but the name is given because opiates are potent agonists that occupy the receptors and mimic the action of the natural transmitters. (18 Nov 1997) |
| opioid-related disorders | Disorders related or resulting from abuse or mis-use of opioids. (12 Dec 1998) |
| opiomelanocortin | A linear polypeptide of the pituitary gland that contains in its sequence the sequences of endorphins, MSH, ACTH, and the like, which are split off enzymically; the nucleotide sequences coding has been determined for several species. (05 Mar 2000) |
| opipramol | <chemical> A tricyclic antidepressant with actions similar to amitriptyline. Pharmacological action: adrenergic uptake inhibitors, antidepressive agents, tricyclic. Chemical name: 1-Piperazineethanol, 4-(3-(5H-dibenz(b,f)azepin-5-yl)propyl)- (12 Dec 1998) |
| opipramol hydrochloride | 4-[3-(5H-Dibenz[b.f ]azepin-5-yl)propyl]-1-piperazineethanol dihydrochloride; an antidepressant agent. (05 Mar 2000) |
| opisthenar | Dorsum of the hand. Origin: G. Back of the hand, from opisthen, behind, + thenar, palm of the hand (05 Mar 2000) |
| opisthiobasial | Relating to both opisthion and basion; denoting a line connecting the two, or the distance between them. (05 Mar 2000) |
| opisthion | <anatomy> The middle of the posterior, or dorsal, margin of the great foramen of the skull. Origin: NL, fr. Gr. Hinder. Source: Websters Dictionary (01 Mar 1998) |
| opisthionasial | Relating to the opisthion and the nasion; denoting the distance between the two points. (05 Mar 2000) |
| opistho- | Backward, behind, dorsal. Origin: G. Opisthen, at the rear, behind (05 Mar 2000) |
| opisthobranchiata | <zoology> A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs. Origin: NL, from Gr. Behind + gills. Source: Websters Dictionary (01 Mar 1998) |
| opisthobranchiate | <zoology> Of or pertaining to the Opisthobranchiata. One of the Opisthobranchiata. Source: Websters Dictionary (01 Mar 1998) |
| opisthocheilia | Opisthochilia Recession of the lips. Origin: opistho-+ G. Cheilos, lip (05 Mar 2000) |
| opossum |
phalanger: small furry Australian arboreal marsupials having long usually prehensile tails nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America
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| operculum |
a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted
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| optic nerve |
the cranial nerve that serves the retina
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| opium poppy |
southwestern Asian herb with greyish leaves and white or reddish flowers; source of opium
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| opt |
choose: select as an alternative; choose instead; prefer as an alternative; "I always choose the fish over the meat courses in this restaurant"; "She opted for the job on the East coast"
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| OP | in an open way |
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| OP | (colloquial) with eyes or mouth open in surprise |
| OP | willingness or readiness to receive esp impressions or ideas |
| OP | characterized by an attitude of ready accessibility esp about one's actions or purposes |
| OP | without obstructions to passage or view |
| OP | a woodworking plane designed to cut rabbets |
| OP | ornamental work (such a embroidery or latticework) having a pattern of openings |
| OP | large African forest tree yielding a strong hard yellow to golden brown lumber |
| OP | theater where opera is performed |
| OP | a drama set to music |
| OP | opera with a happy ending and in which some of the text is spoken |
| OP | a large cloak worn over evening clothes |