noun Cell Biology.
an immature leukocyte.
Also, leucoblast.

1900–05; leuko- + -blast

leukoblastic, adjective
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World English Dictionary
leucoblast or esp (US) leukoblast (ˈluːkəʊˌblɑːst)
an immature leucocyte
leukoblast or esp (US) leukoblast

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

leukoblast leu·ko·blast (lōō'kə-blāst')
An immature white blood cell formed during the transition from lymphoidocyte to promyelocyte. Also called proleukocyte.

leu'ko·blas'tic adj.
The American Heritage® Stedman's Medical Dictionary
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