/ Dictionary / Index D diphyllous: Meaning and Definition of Find definitions for: di•phyl•lous Pronunciation: (dī-fil'us), [key] — adj. Bot. having two leaves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diphyletic diphyodont 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