adjective Biology.
having dissimilar pairs of genes for any hereditary characteristic.
of or pertaining to a heterozygote.
Also, heterozygotic [het-uh-roh-zahy-got-ik] .

1900–05; hetero- + Greek zygós, adj. derivative of zygón yolk; see -ous

heterozygosity [het-uh-roh-zahy-gos-i-tee] , noun
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World English Dictionary
heterozygous (ˌhɛtərəʊˈzaɪɡəs)
genetics Compare homozygous (of an organism) having different alleles for any one gene: heterozygous for eye colour

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American Heritage
Medical Dictionary

heterozygous het·er·o·zy·gous (hět'ər-ə-zī'gəs)

  1. Having different alleles at one or more corresponding chromosomal loci.

  2. Of or relating to a heterozygote.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
heterozygous   (hět'ər-ə-zī'gəs)  Pronunciation Key 
Relating to a cell that has two different alleles at corresponding positions on homologous chromosomes. Compare homozygous.
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