[het-er-uh-zahy-goht, -zig-oht]
noun Genetics.
a hybrid containing genes for two unlike forms of a characteristic, and therefore not breeding true to type.

1900–05; hetero- + zygote

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World English Dictionary
heterozygote (ˌhɛtərəʊˈzaɪɡəʊt, -ˈzɪɡəʊt)
Compare homozygote an animal or plant that is heterozygous; a hybrid

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

heterozygote het·er·o·zy·gote (hět'ə-rō-zī'gōt')
An organism that has different alleles at a particular gene locus on homologous chromosomes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But consider a scenario where one parent is a heterozygote, and the other a homozygote for the dominant trait.
Prenatal diagnosis and heterozygote detection are now possible.
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