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From Biology-Online Dictionary | Biology-Online Dictionary
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A decrease in the number of leukocytes in the blood.


Low white blood cell counts are linked with chemotherapy, radiation therapy, leukemia, and aplastic anemia.

Word origin: leukocyte + Greek penía (poverty, need).
Related forms: leukopenic (adjective).

Synonym: leucopenia (or leukopenia)
Compare: leukocytosis