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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Example sentences
We propose that these conditions may result in reduced metabolic costs of growth among the heterozygous individuals.
Outbreeding depression can and does occur when genes from two heterozygous parents come together to interact in a bad way.
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