/ Dictionary / Index D dicotyledon: Meaning and Definition of Find definitions for: di•cot•y•le•don Pronunciation: (dī-kot"l-ēd'n, dī"kot-l-), [key] — n. Bot. any angiospermous plant of the class (or subclass) Dicotyledoneae, producing seeds with two cotyledons and having an exogenous manner of growth. Cf. monocotyledon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dicotyledon (Thesaurus) dicot dicotyledonous 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