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A large cell of the bone marrow that has a lobulated nucleus and releases platelets into the bloodstream.
(Physiology) an abnormally large bone marrow cell, with a lobulated nucleus, that produces platelets through the fragmentation of its cytoplasm
meg•a•kar•y•o•cyte(ˌmɛg əˈkær i əˌsaɪt)
a large bone marrow cell, with a lobed nucleus, whose cytoplasm is the source of blood platelets.