WordReference Random House Unabridged Dictionary of American English © 2026
het•er•o•chro•ma•tin
(het′ər ə krō′mə tin),USA pronunciation n. [Genetics.]
- Geneticsthe dense, highly stainable part of a chromosome. Cf. euchromatin.
- hetero- + chromatin 1930–35
'heterochromatin' also found in these entries (note: many are not synonyms or translations):