/ Dictionary / Index H heterochromatin: Meaning and Definition of Find definitions for: het•er•o•chro•ma•tin Pronunciation: (het"ur-u-krō'mu-tin), [key] — n. Genetics. the dense, highly stainable part of a chromosome. Cf. euchromatin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heterochromatic heterochrome Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language