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alarm clock

noun
1.
a clock with a bell or buzzer that can be set to sound at a particular time, as to awaken someone.
Origin
1690-1700
1690-1700
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for alarm-clock

alarm clock

noun
1.
a clock with a mechanism that sounds at a set time: used esp for waking a person up
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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7
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