/ Dictionary / Index P polygenism: Meaning and Definition of Find definitions for: po•lyg•e•nism Pronunciation: (pu-lij'u-niz"um), [key] — n. the theory that the human race has descended from two or more ancestral types. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polygenic inheritance polyglot Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language