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Meaning of heterochromatin

het•er•o•chro•ma•tin

Pronunciation: (het"ur-u-krō'mu-tin), [key]
— n. Genetics.
  1. the dense, highly stainable part of a chromosome. Cf. euchromatin.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.