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. 2013.
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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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Alarm clock is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a fool or simpleton; ninny.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Example sentences
But it also plays web radio, has an alarm clock, and can even store tunes on
  its own built-in flash memory.
For some, that's exactly the type of alarm clock they want.
AC stated that around seven o'clock in the morning, the alarm clock on her cell
  phone went off.
Take it with you and you won't have to worry about misunderstanding the alarm
  clock in your room.
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