[ hoh-muh-zahy-guh s, hom-uh- ]
/ ˌhoʊ məˈzaɪ gəs, ˌhɒm ə- /

adjective Biology.

having identical pairs of genes for any given pair of hereditary characteristics.
of or relating to a homozygote.

Nearby words

  1. homotypic cortex,
  2. homovanillic acid,
  3. homozygosis,
  4. homozygosity,
  5. homozygote,
  6. homozygous by descent,
  7. homs,
  8. homuncular,
  9. homunculus,
  10. homy

Also ho·mo·zy·got·ic [hoh-moh-zahy-got-ik, hom-oh-] /ˌhoʊ moʊ zaɪˈgɒt ɪk, ˌhɒm oʊ-/.

Origin of homozygous

1900–05; homo- + Greek -zygos; see zygo-, -ous

Related formsho·mo·zy·gos·i·ty [hoh-moh-zahy-gos-i-tee, -zi-, hom-oh-] /ˌhoʊ moʊ zaɪˈgɒs ɪ ti, -zɪ-, ˌhɒm oʊ-/, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for homozygosity


/ (ˌhəʊməʊˈzaɪɡəs, -ˈzɪɡ-, ˌhɒm-) /


genetics (of an organism) having identical alleles for any one genethese two fruit flies are homozygous for red eye colour Compare heterozygous
Derived Formshomozygously, adverb

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

Word Origin and History for homozygosity



1902, from homo- (1) "same" + zygote + -ous. Related: homozygote.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for homozygosity


[ hō′mō-zī-gŏsĭ-tē, hŏm′ō- ]


The condition of having identical genes at one or more loci in homologous chromosome segments.


[ hō′mō-zīgəs, -mə-, hŏm′ə- ]


Having the same alleles at one or more gene loci on homologous chromosome segments.

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

Science definitions for homozygosity


[ hō′mō-zīgəs ]

Relating to a cell that has two identical alleles for a particular trait at corresponding positions on homologous chromosomes. Compare heterozygous.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.