| a form of cancer in which abnormal cells with many hairlike cytoplasmic projections appear in the bone marrow, liver, spleen, and blood. |
hairy cell leukemia also hair·y-cell leukemia  (hâr'ē-sěl')  n. A rare form of leukemia, usually originating with B cells, characterized by cells with cilialike projections that proliferate in the bone marrow, spleen, and liver. |
hairy cell leukemia n.
A lymphocytic leukemia, usually originating with B cells, and characterized by splenomegaly and cells with a ciliated appearance in the spleen, bone marrow, liver, and blood. Also called leukemic reticuloendotheliosis.