| orifice of external acoustic meatus | The orifice of the external acoustic meatus in the tympanic portion of the temporal bone. Synonym: porus acusticus externus, external acoustic foramen, external acoustic pore, external auditory pore, external auditory foramen, orifice of external acoustic meatus. (05 Mar 2000) |
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| orifice of inferior vena cava | The orifice through which the inferior vena cava opens into the right atrium. Synonym: ostium venae cavae inferioris, orifice of inferior vena cava. (05 Mar 2000) |
| orifice of internal acoustic meatus | The inner opening of the internal acoustic meatus on the posterior surface of the petrous part of the temporal bone. Synonym: porus acusticus internus, internal acoustic foramen, internal acoustic pore, auditory pore, internal auditory foramen, orifice of internal acoustic meatus. (05 Mar 2000) |
| orifice of superior vena cava | The point of entry of the superior vena cava into the right atrium. Synonym: ostium venae cavae superioris, orifice of superior vena cava. (05 Mar 2000) |
| orificial | Relating to an orifice of any kind. (05 Mar 2000) |
| orificium | Synonym: orifice, orifice. Origin: L. (05 Mar 2000) |
| orificium externum uteri | The vaginal opening of the uterus. Synonym: ostium uteri, mouth of the womb, opening of uterus, orificium externum uteri, os uteri externum, ostium uteri externum. (05 Mar 2000) |
| orificium internum uteri | An elongated constriction at the junction of the body and cervix of the uterus. Synonym: isthmus uteri, Guyon's isthmus, orificium internum uteri, os uteri internum, ostium uteri internum. (05 Mar 2000) |
| orificium ureteris | The opening of the ureter in the bladder, situated one at each lateral angle of the trigone; wide gaping of the ostium usually indicates vesicoureteral reflux. Synonym: ostium ureteris, orificium ureteris, ureteral meatus, ureteral opening. (05 Mar 2000) |
| orificium urethrae externum | The slitlike opening of the urethra in the glans penis, the external orifice of the urethra (in the female) in the vestibule, usually upon a slight elevation, the papilla urethrae. Synonym: ostium urethrae externum, external opening of urethra, meatus urinarius, orificium urethrae externum. (05 Mar 2000) |
| orificium vaginae | The narrowest portion of the canal, in the floor of the vestibule posterior to the urethral orifice. Synonym: ostium vaginae, orificium vaginae, vaginal opening. (05 Mar 2000) |
| origanum | <botany> A genus of aromatic labiate plants, including the sweet marjoram (O. Marjorana) and the wild marjoram (O. Vulgare). Origin: L. Origanum, Gr, prob. Fr. Mountain + brightness, beauty. Cf. Organy. Source: Websters Dictionary (01 Mar 1998) |
| origanum oil | The volatile oil (which contains carvacrol) obtained from various species of Origanum (family Labiatae); used as a rubefacient, as a constituent in veterinary liniments, and in microscopic techniques. (05 Mar 2000) |
| origin | 1. The first existence or beginning of anything; the birth. "This mixed system of opinion and sentiment had its origin in the ancient chivalry." (Burke) 2. That from which anything primarily proceeds; the fountain; the spring; the cause; the occasion. 3. <anatomy> The point of attachment or end of a muscle which is fixed during contraction; in contradistinction to insertion. <mathematics> Origin of coordinate axes, the point where the axes intersect. See Note under Ordinate. Synonym: Commencement, rise, source, spring, fountain, derivation, cause, root, foundation. Origin, Source. Origin denotes the rise or commencement of a thing; source presents itself under the image of a fountain flowing forth in a continuous stream of influences. The origin of moral evil has been much disputed, but no one can doubt that it is the source of most of the calamities of our race. "I think he would have set out just as he did, with the origin of ideas the proper starting point of a grammarian, who is to treat of their signs." (Tooke) "Famous Greece, That source of art and cultivated thought Which they to Rome, and Romans hither, brought." (Waller) Origin: F. Origine, L. Origo, -iginis, fr. Oriri to rise, become visible; akin to Gr. To stir up, rouse, Skr. R, and perh. To E. Run. Source: Websters Dictionary (01 Mar 1998) |
| origin of replication | <molecular biology> Regions of DNA that are necessary for its replication to begin, such as pBR322 ori, required for plasmid replication. (18 Nov 1997) |
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| Oriental sore |
cutaneous leishmaniasis: leishmaniasis of the skin; characterized by ulcerative skin lesions
Ãâó: wordnet.princeton.edu/perl/webwn
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| orientation |
the act of orienting an integrated set of attitudes and beliefs position or alignment relative to points of the compass or other specific directions predilection: a predisposition in favor of something; "a predilection for expensive cars"; "his sexual preferences"; "showed a Marxist orientation" a person's awareness of self with regard to position and time and place and personal relationships orientation course: a course introducing a new situation or environment
Ãâó: wordnet.princeton.edu/perl/webwn
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| orifice |
an aperture or hole that opens into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart"
Ãâó: wordnet.princeton.edu/perl/webwn
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| origin |
beginning: the place where something begins, where it springs into being; "the Italian beginning of the Renaissance"; "Jupiter was the origin of the radiation"; "Pittsburgh is the source of the Ohio River"; "communism's Russian root" properties attributable to your ancestry; "he comes from good origins" an event that is a beginning; a first part or stage of subsequent events the point of intersection of coordinate axes; where the values of the coordinates are all zero lineage: the descendants of one individual; "his entire lineage has been warriors"
Ãâó: wordnet.princeton.edu/perl/webwn
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| orienting reflex |
the response of an animal to an unexpected or novel stimulus or alteration of a stimulus; it involves adjustments of head, body, or sensory organs to pay close attention to the stimulus. In higher vertebrates including humans it is mediated at the brain stem level. Called also orienting response.
Ãâó: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| ori | Asiatic shrub or small tree widely planted in United States and Europe |
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| ori | introduced into United States from the Orient |
| ori | ornamental Asiatic vine with showy orange-yellow fruit with a scarlet aril |
| ori | edible east Asian mushroom having a golden or dark brown to blackish cap and an inedible stipe |
| ori | woody oriental plant with smooth unfurrowed red fruit grown especially for its white or pale pink blossoms |
| ori | ornamental tree with inedible fruits widely cultivated in many varieties for its white blossoms |
| ori | dark brown cockroach originally from orient now nearly cosmopolitan in distribution |
| ori | Eastern Asian plant |
| ori | a member of an Oriental race |
| ori | large tree of southeastern Europe to Asia Minor |
| ori | commonly cultivated Asiatic perennial poppy having stiff heavily haired leaves and bright scarlet or pink to orange flowers |
| ori | dark brown cockroach originally from orient now nearly cosmopolitan in distribution |
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