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 of alarm clock

First recorded in 1690–1700
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for alarm clock

alarm clock

noun

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