One of the mysteries of the English language finally explained.
Originally: any of various forms of lymphoid neoplasia or hyperplasia in which there is no increase in lymphocytes in the peripheral blood (now disused). In later use: any of various non-malignant conditions in which there is a leukocytosis resembling that of leukaemia.
Late 19th century. From pseudo- + leukaemia, after German Pseudoleukämie.
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