/ Dictionary / Index D diphyletic: Meaning and Definition of Find definitions for: di•phy•let•ic Pronunciation: (dī"fī-let'ik), [key] — adj. Biol. of or pertaining to a taxonomic group of organisms derived from two separate ancestral lines. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diphycercal diphyllous Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language