/ Dictionary / Index P polygenic inheritance: Meaning and Definition of Find definitions for: polygen'ic inher'itance Pronunciation: [key] — Genetics. Genetics. the heredity of complex characters that are determined by a large number of genes, each one usually having a relatively small effect. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polygenetic polygenism Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language