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[het-er-uh-kroh-muh-sohm] /ˌhɛt ər əˈkroʊ məˌsoʊm/
noun, Genetics.
Origin of heterochromosome
First recorded in 1900-05; hetero- + chromosome Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for heterochromosome
Historical Examples
  • Figures 72-74 show the metakinesis of the heterochromosome bivalent.

    Studies in Spermatogenesis Nettie Maria Stevens
  • The heterochromosome group is blended into a vacuolated sphere in growth stages (figs. 199, 200).

    Studies in Spermatogenesis Nettie Maria Stevens
  • Figure 137 is an exceptional anaphase in which the heterochromosome elements are not mingled with the polar masses of chromatin.

    Studies in Spermatogenesis Nettie Maria Stevens
  • Bouquet stage from iron-hæmatoxylin preparations, showing the heterochromosome bivalent (x).

    Studies in Spermatogenesis Nettie Maria Stevens
  • Of the insects considered in this paper Aphis and Termopsis have no "accessory chromosome" or "heterochromosome" of any kind.

British Dictionary definitions for heterochromosome


an atypical chromosome, esp a sex chromosome
a chromosome composed mainly of heterochromatin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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heterochromosome in Medicine

heterochromosome het·er·o·chro·mo·some (hět'ə-rō-krō'mə-sōm')

  1. A chromosome composed primarily of heterochromatin.

  2. See allosome.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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