| sentinel | 1. One who watches or guards; specifically, a soldier set to guard an army, camp, or other place, from surprise, to observe the approach of danger, and give notice of it; a sentry. "The sentinels who paced the ramparts." (Macaulay) 2. Watch; guard. "That princes do keep due sentinel." 3. <zoology> A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks. Synonym: sentinel crab. Origin: F. Sentinelle (cf. It. Sentinella); probably originally, a litle path, the sentinel's beat, and a dim. Of a word meaning, path; cf. F. Sente path. L. Semita; and OF. Sentine, sentele, senteret, diminutive words. Cf. Sentry. Source: Websters Dictionary (01 Mar 1998) |
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| sentinel animal | An animal deliberately placed in a particular environment to detect the presence of an infectious agent, such as a virus. (05 Mar 2000) |
| sentinel gland | A single enlarged lymph node in the omentum that may be an indication of an ulcer opposite to it in the greater or lesser curvature of the stomach. (05 Mar 2000) |
| sentinel loop sign | In gastrointestinal radiology, dilatation of a segment of large or small intestine, indicative of localised ileus from nearby inflammation. (05 Mar 2000) |
| sentinel pile | A circumscribed thickening of the mucous membrane at the lower end of a fissure of the anus. (05 Mar 2000) |
| sentinel spinous process fracture | Fracture of the spinous process with undetected deeper fracture's of the vertebral arch. (05 Mar 2000) |
| sentinel surveillance | Monitoring of rate of occurrence of specific conditions to assess the stability or change in health levels of a population. It is also the study of disease rates in a specific cohort, geographic area, population subgroup, etc. To estimate trends in larger population. (12 Dec 1998) |
| sentinel tag | Projecting edematous skin at the lower end of an anal fissure. (05 Mar 2000) |
| agonal clot | Intravascular thrombosis ascribed to the process of dying. (05 Mar 2000) |
| antemortem clot | A blood clot, found at autopsy, formed in any of the heart cavities or the great vessels before death. (05 Mar 2000) |
| blood clot | <haematology> The conversion of blood from a liquid form to solid through the process of coagulation. A thrombus is a clot which forms inside of a blood vessel. If that clot moves inside the vessel it is referred to as an embolus (embolism). The presence of atherosclerotic plaque lining blood vessel walls is a significant stimulus for clot formation. (27 Sep 1997) |
| passive clot | A clot formed in an aneurysmal sac consequent to the cessation or slowing of circulation through the aneurysm. (05 Mar 2000) |
| medication, clot-dissolving | Drugs used to dissolve blood clots. Agents such as plasminogen-activator (t-pa) and streptokinase that are effective in dissolving clots and re-opening arteries. Used, for example, in the treatment of heart attacks. Clot-dissolvers are also called thrombolytic agents. (12 Dec 1998) |
| chicken fat clot | Clot formed in vitro or postmortem from leukocytes and plasma of sedimented blood. (05 Mar 2000) |
| clot | 1. To coagulate, said especially of blood. 2. A soft, nonrigid, insoluble mass formed when a liquid (e.g., blood or lymph) gels. Origin: O.E. Klott, lump (05 Mar 2000) |