/ Dictionary / Index H heterozygote: Meaning and Definition of Find definitions for: het•er•o•zy•gote Pronunciation: (het"ur-u-zī'gōt, -zig'ōt), [key] — n. Genetics. a hybrid containing genes for two unlike forms of a characteristic, and therefore not breeding true to type. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heterozygote (Thesaurus) heterozygosis heterozygous Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language