noun Genetics.
the dense, highly stainable part of a chromosome.
Compare euchromatin.

1930–35; hetero- + chromatin

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World English Dictionary
heterochromatin (ˌhɛtərəʊˈkrəʊmətɪn)
Compare euchromatin the condensed part of a chromosome that stains strongly with basic dyes in nondividing cells and has little genetic activity

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American Heritage
Medical Dictionary

heterochromatin het·er·o·chro·ma·tin (hět'ə-rō-krō'mə-tĭn)
The part of the chromonema that remains tightly coiled and condensed during interphase and thus stains readily.

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