Absence or great reduction (relative or absolute) of the number of white blood cells in the circulating blood ( i.e., an advanced degree of leukopenia), or the lack of leukocytes in an anatomical lesion. [G. a- priv. + leukos, white, + kytos, a hollow (cell)]

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aleu·ko·cy·to·sis (a-loo″ko-si-toґsis) [a-1 + leukocyte + -osis] leukopenia.

Medical dictionary. 2011.

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  • leukopenia — The antithesis of leukocytosis; any situation in which the total number of leukocytes in the circulating blood is less than normal, the lower limit of which is generally regarded as 4000–5000/mm3. SYN: leukocytopenia. [leuko(cyte) + G. penia,… …   Medical dictionary