| leukocytoblast | A non-specific term for any immature cell from which a leukocyte develops, including lymphoblast, myeloblast, and the like. Origin: Leukocyte + G. Blastos, germ (05 Mar 2000) |
|---|---|
| leukocytoclasis | Karyorrhexis of leukocytes. Origin: Leuko-+ G. Kytos, cell, + klasia, a breaking (05 Mar 2000) |
| leukocytoclastic vasculitis | Cutaneous acute vasculitis characterised clinically by palpable purpura, especially of the legs, and histologically by exudation of the neutrophils and sometimes fibrin around dermal venules, with nuclear dust and extravasation of red cells; may be limited to the skin or involve other tissues as in Henoch-Schonlein purpura. See: cutaneous vasculitis. Origin: G. Leukos, white, + kytos, cell, + klastos, broken, fr. Klao, to break (05 Mar 2000) |
| leukocytogenesis | The formation and development of leukocytes. Origin: Leukocyte + G. Genesis, production (05 Mar 2000) |
| leukocytoid | Resembling a leukocyte. Origin: Leukocyte + G. Eidos, resemblance (05 Mar 2000) |
| leukocytolysin | Any substance (including lytic antibody) that causes dissolution of leukocytes. Synonym: leukolysin. (05 Mar 2000) |
| leukocytolysis | Dissolution or lysis of leukocytes. Synonym: leukolysis. Origin: Leukocyte + G. Lysis, dissolution (05 Mar 2000) |
| leukocytolytic | Pertaining to, causing, or manifesting leukocytolysis. Synonym: leukolytic. (05 Mar 2000) |
| leukocytoma | A fairly well circumscribed, nodular, dense accumulation of leukocytes. Origin: Leukocyte + G. -oma, tumour (05 Mar 2000) |
| leukocytometer | A standarised glass slide that is suitably ruled for counting the leukocytes in a measured volume of accurately diluted blood (or other specimens). Origin: Leukocyte + G. Metron, measure (05 Mar 2000) |
| leukocytopenia | Abnormal decrease in the number of leukocytes in the blood (white blood cells that help to combat infection). (16 Dec 1997) |
| leukocytoplania | Movement of leukocytes from the lumens of blood vessels, through serous membranes, or in the tissues. Origin: Leukocyte + G. Plane, a wandering (05 Mar 2000) |
| leukocytopoiesis | Synonym: leukopoiesis. Origin: Leukocyte + G. Poiesis, a making (05 Mar 2000) |
| leukocytosis | A term used to describe an abnormal elevation on the white blood cell count. Normal white blood cell counts are variable with age and sex. Normal adult range is 4, 500 to 11,000 cells per cubic millimetre of blood. Slightly higher counts are seen in children. Elevated counts can be seen in cases of inflammation and infection. (27 Sep 1997) |
| leukocytosis of the newborn | An apparently "physiologic" leukocytosis usually observed in newborn infants, in whom the white blood cell counts are usually greater than 10,000 per cu mm, and sometimes range to 45,000 per cu mm, resulting chiefly from increased numbers of neutrophils (especially single and bilobed forms). On the third or fourth day of life, the count generally decreases rapidly, and then fluctuates for several days; beginning about the fourth week of life, a relative lymphocytosis is observed, and this normally continues for a few years. (05 Mar 2000) |