alarm clockaˈlarm clock noun [countable] 
Examples
a clock that makes a noise at a particular time to wake you up
ExamplesEXAMPLES FROM THE CORPUS
word sets- A neighbour had made sure he was awake; there was no alarm clock at home.
- I rolled over, sat up, blinked, and glared at the alarm clock.
- Lutine Bell alarm clock by Wherle Decosphere light.
- The alarm clock overhead read 5.28, time for a quick cup of tea before his new shift began.
- To give you an idea what that means, 80 decibels is generated by a typical alarm clock.
- Voice-control AB313 travel alarm clock showing world time zones, £21.95.
WORD SETS► Chronology
AD, advance, verbafter, prepositionafternoon, nounalarm, nounalarm clock, nouna.m., Anno Domini, annual, adjectiveApril, nounAsh Wednesday, nounAug., August, nounautumn, nounautumnal, adjectivebank holiday, nounBC, BCE, biannual, adjectivebicentenary, nounbicentennial, nounbiennial, adjectivebimonthly, adjectivebirthday, nounbiweekly, adjectivebonfire night, nounBoxing Day, nounBritish Summer Time, nounBST, nouncalendar, nouncalendar month, nouncalendar year, nouncarriage clock, nouncentenary, nouncentury, nounChristmas, nounChristmas Day, nounChristmas Eve, nounChristmastime, nounchronograph, nounchronological, adjectivechronometer, nouncircadian, adjectiveclock, nouncrystal, nouncuckoo clock, nouncycle, nouncyclic, adjectivedaily, adjectivedaily, adverbdate, noundate, verbdawn, nounday, nounDec., decade, nounDecember, noundiamond anniversary, noundiamond jubilee, noundinnertime, noundiurnal, adjectived.o.b., due date, noundusk, nounface, nounFather's Day, nounfeast, nounFebruary, nounfortnightly, adjectiveFourth of July, the, Fri., Friday, nounGood Friday, nounGreenwich Mean Time, nounGregorian calendar, nounguy, nounGuy Fawkes Night, nounhalf-hourly, adjectivehalf-yearly, adjectiveHalloween, nounhand, nounHanukkah, nounharvest festival, nounHogmanay, nounhorn, nounhour, nounhourglass, nounhour hand, nounhr, Independence Day, nounJan., January, nounjubilee, nounJuly, nounJune, nounLabor Day, nounleap year, nounlunar month, nounmainspring, nounman-hour, nounMar., March, nounMardi Gras, nounmarket day, nounMaundy Thursday, nounMay, nounMay Day, nounMichaelmas, nounmidday, nounmiddle age, nounmiddle-aged, adjectivemidnight, nounMidsummer Day, nounmidweek, adjectivemillennium, nounmin., minute hand, nounMon., Monday, nounmonth, nounmorn, nounmorning, nounMothering Sunday, nounMother's Day, nounmovable feast, nounnew moon, nounNew Year, nounNew Year's Day, nounNew Year's Eve, nounnight, nounnightfall, nounnighttime, nounnocturnal, adjectiveNoel, nounnoon, nounnoonday, adjectiveNov., November, nounOct., October, nounp.a., Pancake Day, nounPDT, penultimate, adjectiveper annum, adverbper diem, adverbperiodic, adjectivep.m., PST, public holiday, nounquarter, nounquotidian, adjectiveRemembrance Day, nounSat., Saturday, nounschoolday, nounseason, nounsecond, nounsecond hand, nounself-winding, adjectiveSeptember, nounshockproof, adjectivesilver anniversary, nounsilver jubilee, nounsilver wedding anniversary, nounsolar year, nounsolstice, nounspring, nounspringtime, nounstandard time, nounstopwatch, nounsummer, nounsummer solstice, nounsummertime, nounsummery, adjectiveSun., Sunday, nounsundown, nounsunrise, nounsunset, nounsun-up, nountercentenary, nounThanksgiving, nounthirty, numberThursday, nountime, nountime, verbtimepiece, nountimer, nountime signal, nountime warp, nountime zone, nountoday, adverbtoday, nountomorrow, adverbtomorrow, nountonight, adverbtonight, nountriennial, adjectiveTuesday, nountwilight, nounWed., Wednesday, nounweek, nounweekday, nounweekend, nounweekly, adjectiveweeknight, nounWhit, nounWhitsun, nounwinter, nounwintertime, nounwk., wristwatch, nounyear, nounyesterday, adverbyr., Yule, nounYuletide, noun
a clock that makes a noise at a particular time to wake you up