/ Dictionary / Index Z zygosity: Meaning and Definition of Find definitions for: zy•gos•i•ty Pronunciation: (zī-gos'i-tē, zi-), [key] — n. Genetics. the characterization of an individual's hereditary traits in terms of gene pairing in the zygote from which it developed. Cf. the characterization of twinning and multiple births in terms of the combination of alleles for particular hereditary traits. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. zygosis zygosporangium Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language