| fever of unknown origin | Fever in which the aetiology cannot be ascertained. (12 Dec 1998) |
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| neoplasms, unknown primary | Metastases in which the tissue of origin is unknown. (12 Dec 1998) |
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| aponeurosis of origin | A tendinous expansion serving as the attachment of origin of a broad muscle. (05 Mar 2000) |
| replication origin | A unique DNA sequence of a replicon at which DNA replication is initiated and proceeds bidirectionally or unidirectionally. It contains the sites where the first separation of the complementary strands occurs, a primer RNA is synthesised, and the switch from primer RNA to DNA synthesis takes place. (rieger et al., glossary of genetics: classical and molecular, 5th ed) (12 Dec 1998) |
| centers of origin | <agriculture> Usually the location in the world where the oldest cultivation of a particular crop has been identified. (09 Oct 1997) |
| nuclei of origin | Collections of motor neurons (forming a continuous column in the spinal cord, discontinuous in the medulla and pons) giving origin to the spinal and cranial motor nerves. Synonym: nuclei originis, motor nuclei. (05 Mar 2000) |
| duck embryo origin vaccine | See: rabies vaccine. (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) |
| ectal origin | Superficial origin, or apparent origin, the point where the nerve emerges from the brain. Origin: L. Origo, source, beginning, fr. Orior, to rise (05 Mar 2000) |
| ental origin | Deep origin, or real origin, the cell group in the brain or medulla, whence the fibres of the nerve begin, and the (05 Mar 2000) |
| absorption fever | An elevation of temperature often occurring, without other untoward symptoms, shortly after childbirth, assumed to be due to absorption of uterine discharges through abrasions of the vaginal wall. (05 Mar 2000) |
| acclimating fever | Elevated temperature with malaise that occurs upon working in a very hot environment. (05 Mar 2000) |
| aden fever | <virology> A tropical disease caused by dengue virus (Arbovirus), that is transmitted by the bite of an infected mosquito of the genus Aedes). Four severity grades of the illness are seen: Grade I: fever and constitutional symptoms. Grade II: grade I plus spontaneous bleeding of skin, gums or gastrointestinal tract. Grade III: grade II plus agitation and circulatory failure. Grade IV: profound shock. Grade I infection is seen most frequently in world travelers, where it is usually self-limited and rarely fatal. The other grades are referred to as dengue haemorrhagic fever and are often fatal. Dengue haemorrhagic fever appears to be an infection by one of the other dengue viruses. Prior immunity to a different dengue virus type appears to be important in the development of the more serious haemorrhagic form. Vaccines are available. Protection from mosquitoes is an important preventive measure. (15 Jan 1998) |
| aestivoautumnal fever | <infectious disease> A tropical parasitic disease caused by one of the genus Plasmodium and carried by infected mosquitoes of the genus Anopheles. This parasite uses red blood cells to complete its reproductive cycle. Common symptoms of an attack include high fever, chills, sweats and body aches. (27 Sep 1997) |
| African haemorrhagic fever | Haemorrhagic fever associated with the morphologically similar but antigenically distinct Marburg and Ebola viruses. See: viral haemorrhagic fever. (05 Mar 2000) |