| odd chromosome | A chromosome existing without its normal homologous chromosome; at the reduction division of gametogenesis an accessory chromosome is likely to be included in one daughter cell and not in the other, but may be lost completely by lagging behind on the equatorial plate. Synonym: monosome, odd chromosome, unpaired allosome, unpaired chromosome. (05 Mar 2000) |
|---|---|
| odd-pinnate | Said of compound leaves having an odd number of leaflets, this is usually easily determined because there is a single terminal leaflet. (09 Oct 1997) |
| odd-year run | Population of fish that returns to spawning grounds in odd-numbered years. (09 Oct 1997) |
| Oddi | Ruggero, Italian physician; 1864-1913. See: Oddi's sphincter. (05 Mar 2000) |
| oddi's sphincter | An annular sheath of muscle that invests the bile duct within the wall of the duodenum. (12 Dec 1998) |
| Oddi, Ruggero | <person> Oddi's Sphincter - sphincteric fibres around the termination of the common bile duct. These had already been described in 1681 by Glisson. Lived: 1845-1906. (05 Dec 1998) |
| odditis | Inflammation of the junction of the duodenum and common bile duct at the sphincter of Oddi. (05 Mar 2000) |
| oddly | 1. In an odd manner; unevently. 2. In a peculiar manner; strangely; queerly; curiously. "A figure a little more oddly turned." "A great black substance,.. Very oddly shaped." (Swift) 3. <mathematics> In a manner measured by an odd number. Source: Websters Dictionary (01 Mar 1998) |
| odds | The ratio of probability of occurrence to non-occurrence of an event. Origin: pl. Of odd, fr. M.E. Odde, fr. O.Norse oddi, odd number (05 Mar 2000) |
| odds ratio | <epidemiology> A comparison of the presence of a risk factor for disease in a sample of diseased subjects and non diseased controls. The number of people with disease who were exposed to a risk factor ( I.e. ) over those with disease who were not exposed ( Io ) divided by those without disease who were exposed ( Ne ) over those without who were not exposed ( No ). Thus OR=(I.e./Io)/(Ne/No)= I.e. No / Io Ne. This measure should be used for case control studies where we retrospectively look at risks in those with and without disease. Also known as exposure odds ratio. (05 Dec 1998) |