/ Dictionary / Index E eardrum: Meaning and Definition of Find definitions for: ear•drum Pronunciation: (ēr'drum"), [key] — n. Anat., Zool. a membrane in the ear canal between the external ear and the middle ear; tympanic membrane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eardrum (Thesaurus) ear drops eared Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language