/ Dictionary / Index P polyphyletic: Meaning and Definition of Find definitions for: pol•y•phy•let•ic Pronunciation: (pol"ē-fī-let'ik), [key] — adj. developed from more than one ancestral type, as a group of animals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polyphony polyploid Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language