/ Dictionary / Index D dicotyledonous: Meaning and Definition of Find definitions for: di•cot•y•le•don•ous Pronunciation: (dī-kot"l-ēd'n-us, dī"kot-l-), [key] — adj. belonging or pertaining to the Dicotyledoneae; having two cotyledons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dicotyledonous (Thesaurus) dicotyledon dicoumarin Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language