Definition of Lymphocytic leukemia, acute (ALL)

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Lymphocytic leukemia, acute (ALL): A rapidly progressing form of leukemia in which there are too many very young (immature) white blood cells called lymphoblasts in the bloodstream and bone marrow.

ALL is spoken not as the word "all", but as the three letters: A.L.L. Acute lymphocytic leukemia is also called acute lymphoblastic leukemia.