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hearing aid

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hearing aid

–noun
a compact electronic amplifier worn to improve one's hearing, usually placed in or behind the ear.

Origin:
1920–25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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hearing aid  
n.  A small electronic apparatus that amplifies sound and is worn in or behind the ear to compensate for impaired hearing.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: hearing aid
Pronunciation: -"Ad
Function: noun
: an electronic device usually worn by a person for amplifying sound before it reaches thereceptor organs
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

hearing aid n.
A small electronic apparatus that amplifies sound and is worn in or behind the ear to compensate for impaired hearing.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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