eardrum

[eer-druhm]
noun Anatomy, Zoology.
a membrane in the ear canal between the external ear and the middle ear; tympanic membrane.

Origin:
1635–45; ear1 + drum1

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Collins
World English Dictionary
eardrum (ˈɪəˌdrʌm)
 
n
the nontechnical name for tympanic membrane

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

eardrum
1640s, from ear (1) + drum.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

eardrum ear·drum (ēr'drŭm')
n.
The thin, semitransparent, oval-shaped membrane that separates the middle ear from the external ear. Also called drum, drumhead, drum membrane, myringa, myrinx, tympanic membrane, tympanum.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
eardrum   (îr'drŭm')  Pronunciation Key 
The thin, oval-shaped membrane that separates the middle ear from the outer ear. It vibrates in response to sound waves, which are then transmitted to the ossicles of the middle ear. Also called tympanic membrane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

eardrum definition


The membrane that divides the outer ear from the middle ear. The vibrations of this membrane in response to sound waves lead to the sensation of hearing. Also called the tympanic membrane.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

eardrum

membrane in the human ear that receives sound vibrations from the outer air and transmits them to the auditory ossicles, which are tiny bones in the tympanic (middle ear) cavity. It also serves as the lateral wall of the tympanic cavity, separating it from the external auditory canal. The membrane lies across the end of the external canal and looks like a flattened cone with its tip (apex) pointed inward. The edges are attached to a ring of bone, the tympanic annulus.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
When the eardrum vibrates as sound hits its surface, it sets the ossicles into
  motion.
When the eardrum is damaged, the hearing process is interrupted.
The infection causes pus or fluid to build up behind the eardrum.
The eardrum is a light-gray color or a shiny pearly-white.
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