| orf | A specific disease of sheep and goats, caused by the orf virus. This virus is transmissible to man and characterised by vesiculation and ulceration of the infected site. Synonym: contagious ecthyma, contagious pustular dermatitis, scabby mouth, soremouth. Origin: O.E. Orfcwealm, murrain, fr. Orf, cattle, + cwealm, destruction (05 Mar 2000) |
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| orf virus | The type species of parapoxvirus which causes a skin infection in natural hosts, usually young sheep. Humans may contract local skin lesions by contact. The virus apparently persists in soil. (12 Dec 1998) |
| orfe | <zoology> A bright-coloured domesticated variety of the id. See Id. Source: Websters Dictionary (01 Mar 1998) |
| orfray | <zoology> The osprey. Origin: F. Orfraie. Cf. Osprey, Ossifrage. Source: Websters Dictionary (01 Mar 1998) |
| orgal | <chemistry> See Argol. Source: Websters Dictionary (01 Mar 1998) |
| organ | 1. An instrument or medium by which some important action is performed, or an important end accomplished; as, legislatures, courts, armies, taxgatherers, etc, are organs of government. 2. <biology> A natural part or structure in an animal or a plant, capable of performing some special action (termed its function), which is essential to the life or well-being of the whole; as, the heart, lungs, etc, are organs of animals; the root, stem, foliage, etc, are organs of plants. In animals the organs are generally made up of several tissues, one of which usually predominates, and determines the principal function of the organ. Groups of organs constitute a system. See System. 3. A component part performing an essential office in the working of any complex machine; as, the cylinder, valves, crank, etc, are organs of the steam engine. 4. A medium of communication between one person or body and another; as, the secretary of state is the organ of communication between the government and a foreign power; a newspaper is the organ of its editor, or of a party, sect, etc. 5. [Cf. AS. Organ, fr. L. Organum. A wind instrument containing numerous pipes of various dimensions and kinds, which are filled with wind from a bellows, and played upon by means of keys similar to those of a piano, and sometimes by foot keys or pedals; formerly used in the plural, each pipe being considired an organ. "The deep, majestic, solemn organs blow." (Pope) Chaucer used the form orgon as a plural. "The merry orgon . . . That in the church goon [go]" Barrel organ, Choir organ, Great organ, etc. See Barrel, Choir, etc. <anatomy> Cabinet organ, a passage in which the tonic or dominant is sustained continuously by one part, while the other parts move. Origin: L. Organum, Gr.; akin to work, and E. Work: cf. F. Organe. See Work, and cf. Orgue, Orgy. Source: Websters Dictionary (01 Mar 1998) |
| organ culture | <cell biology> Culture in vitro of pieces of tissue (as opposed to single cells) in such a way as to maintain some normal spatial relationships between cells and some normal function. Contrast with tissue culture. (18 Nov 1997) |
| organ of corti | The organ that contains the special sensory receptors for hearing. It is composed of a series of epithelial structures placed upon the inner part of the basilar membrane. (12 Dec 1998) |
| organ of hearing | The content of the cochlea including the portion of the membranous labyrinth containing the spiral organ (cochlear duct) and the perilymphatic channels (scalae) which lie on either side. Synonym: labyrinthus cochlearis, organ of hearing. (05 Mar 2000) |
| organ of Rosenmuller | <anatomy> See Parovarium. Origin: NL, from Gr. Upon + egg + to bear. Source: Websters Dictionary (01 Mar 1998) |
| organ of smell | The olfactory region in the superior portion of the nasal cavity. Synonym: organum olfactus, organ of smell. (05 Mar 2000) |
| organ of taste | Located in the papillae of the mucous membrane of the tongue, chiefly in the vallate papillae. Synonym: organum gustus, organ of taste. (05 Mar 2000) |
| organ of touch | Any one of the sensory end organs. Synonym: organum tactus, tactile organ. (05 Mar 2000) |
| organ of vision | The eye and its adnexa. Synonym: organum visus, organ of vision. (05 Mar 2000) |
| organ of zuckerkandl | <radiology> Para-aortic chromaffin body, adjacent to abdominal sympathetic plexus, site: aortic bifurcation or IMA origin, most common extra-adrenal site of pheochromocytoma (12 Dec 1998) |
Synonyms :
Synonyms :
Synonyms :
Synonyms : Fistula, Oroantral, Fistulas, Oroantral, Oroantral Fistulas
Synonyms :
| orthoscope |
an ophthalmoscope with a layer of water to neutralize the refraction of the cornea
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| orbitale |
the craniometric point at the lowest point on the lower edge of the orbit
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| orchidectomy |
surgical removal of one or both testicles
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| orgasm |
the moment of most intense pleasure in sexual intercourse
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| Oriental sore |
cutaneous leishmaniasis: leishmaniasis of the skin; characterized by ulcerative skin lesions
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| OR | a condition of regular or proper arrangement |
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| OR | place in a certain order |
| OR | bring order to or into |
| OR | assign a rank or rating to |
| OR | arrange thoughts, ideas, temporal events, etc. |
| OR | make a request for something |
| OR | give instructions to or direct somebody to do something |
| OR | issue commands or orders for |
| OR | appoint to a clerical posts |
| OR | bring into conformity with rules or principles or usage |
| OR | mites and ticks |
| OR | in some classifications an alternative name for the Falconiformes |