| osgood-schlatter disease | <disease> A common knee disorder in teenage boys, results from the chronic avulsion of the tibial tubercle, a bony prominence on the tibia. Symptoms include knee pain with range of motion, especially against resistance. Knee pain is often worse after prolonged physical activity. (27 Sep 1997) |
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| OSHA | <abbreviation> Occupational Safety and Health Administration of the U.S. Department of Labour, responsible for establishing and enforcing safety and health standards in the workplace. (05 Mar 2000) |
| osier | <botany> A kind of willow (Salix viminalis) growing in wet places in Europe and Asia, and introduced into North America. It is considered the best of the willows for basket work. The name is sometimes given to any kind of willow. One of the long, pliable twigs of this plant, or of other somilar plants. "The rank of osiers by the murmuring stream." (Shak) Osier bed, or Osier holt, a place where willows are grown for basket making. Red osier. A kind of willow with reddish twigs (Salix rubra). An American shrub (Cornus stolonifera) which has slender red branches; also called osier cornel. Origin: F. Osier: cf. Prov. F. Oisis, Armor. Ozil, aozil, Gr, L. Vitex, and E. Withy. Source: Websters Dictionary (01 Mar 1998) |
| osiris | One of the principal divinities of Egypt, the brother and husband of Isis. He was figured as a mummy wearing the royal cap of Upper Egypt, and was symbolized by the sacred bull, called Apis. Cf. Serapis. Osir"ian. Origin: L, fr. Gr.; of Egyptian origin. Source: Websters Dictionary (01 Mar 1998) |
| oskar | An egg polarity gene in Drosophila, concentrated at the posterior pole of the egg and required for subsequent posterior structures. A maternal effect gene. (18 Nov 1997) |
| Osler | Sir William, Canadian physician in U.S. And England, 1849-1919. See: Osler's disease, Osler node, Osler's sign, Rendu-Osler-Weber syndrome. (05 Mar 2000) |
| Osler node | A tender cutaneous lesion, probably of immunopathic origin, characteristic of subacute bacterial endocarditis; small, raised, and discolored, these node's usually appear in the pads of fingers or toes. (05 Mar 2000) |
| Osler's disease | Overproduction (proliferation) of red blood cells due to bone marrow disease (myeloproferative disorder). Pv tends to evolve into acute leukaemia or a condition with the marrow replaced by scar tissue (myelofibrosis) (12 Dec 1998) |
| Osler's sign | <clinical sign> In acute bacterial endocarditis, circumscribed painful erythematous swellings, ranging in size from that of a pinhead to that of a pea, in the skin and subcutaneous tissues of the hands and feet. (05 Mar 2000) |
| Osler-Vaquez disease | Overproduction (proliferation) of red blood cells due to bone marrow disease (myeloproferative disorder). Pv tends to evolve into acute leukaemia or a condition with the marrow replaced by scar tissue (myelofibrosis) (12 Dec 1998) |
| osler-weber-rendu disease | <disease> An inherited disease characterised by thin blood vessel walls in the nose, skin and gastrointestinal tract. This condition ins associated with a high risk of bleeding complications. (27 Sep 1997) |
| osmanli | Origin: So called from Osman. See Ottoman. A Turkish official; one of the dominant tribe of Turks; loosely, any Turk. Source: Websters Dictionary (01 Mar 1998) |
| osmate | <chemistry> A salt of osmic acid. [Formerly written also osmiate. Source: Websters Dictionary (01 Mar 1998) |
| osmaterium | Origin: NL, fr. Gr. Smell. <zoology> One of a pair of scent organs which the larvae of certain butterflies emit from the first body segment, either above or below. Source: Websters Dictionary (01 Mar 1998) |
| osmatic | Synonym: olfactory. Origin: G. Osme, smell (05 Mar 2000) |