from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The thin, semitransparent, oval-shaped membrane that separates the middle ear from the external ear. Also called tympanic membrane, tympanum.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A thin membrane that separates the outer ear from the middle ear and transmits sound from the air to the malleus.
from the GNU version of the Collaborative International Dictionary of English
- n. The tympanum. See Illust. of ear.
from The Century Dictionary and Cyclopedia
- n. The middle ear; the tympanum. See tympanum, and first cut under ear.
- n. More especially, the tympanic membrane: as, to burst or puncture the ear-drum. See cuts under ear and tympanic.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the membrane in the ear that vibrates to sound
ear + drum (Wiktionary)