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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
alarm clock
 
n
a clock with a mechanism that sounds at a set time: used esp for waking a person up

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
At dawn the beeping of your alarm clock drills relentlessly into your
  consciousness.
Her father redesigned his alarm clock to switch on their home's furnace before
  he got out of bed.
Nobody buys a new fridge or alarm clock every other year, because the feature
  sets of those product categories are mature.
Minuscule remote, no elaborate alarm clock, no fancy programming options.
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