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Alarm clock

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alarm clock

–noun
a clock with a bell or buzzer that can be set to sound at a particular time, as to awaken someone.

Origin:
1690–1700
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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alarm clock  
n.  A clock that can be set to sound a bell or buzzer at a desired hour.
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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