(also alarm ) noun
a clock that you can set to ring a bell, etc. at a particular time and wake you up :
I set the alarm clock for 7 o'clock.
(also alarm ) noun
a clock that you can set to ring a bell, etc. at a particular time and wake you up :
I set the alarm clock for 7 o'clock.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005