/ Dictionary / Index A acotyledon: Meaning and Definition of Find definitions for: a•cot•y•le•don Pronunciation: (ā'kot"l-ēd'n, ā-kot"-), [key] — n. a plant without cotyledons, therefore one belonging to a group lower than the seed plants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acorn worm acouasm Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language