GNU Collaborative International Dictionary of English

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1.       
   megakaryocyte  n. (Anat.) A large bone marrow cell not usually found in the circulating blood; it is regarded as the precursors of blood platelets; it is up to 100 μm in diameter, with a polyploid nucleus. Also referred to as megacaryocyte, megalokaryocyte, and thromboblast.
   WordNet 1.5
   +PJC