Alarm Clock Definition

noun
A clock that can be set to wake someone up or alert attention at a particular time, as by sounding a bell or buzzer.
American Heritage
A clock that can be set to ring, buzz, or flash a light at any particular time, as to awaken a person.
Webster's New World

A clock with an alarm that can be set to sound at a determined time.

Wiktionary
Synonyms:

Other Word Forms of Alarm Clock

Noun

Singular:
alarm clock
Plural:
alarm-clocks

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alarm clock