► 名詞目覚まし  [(2)めざまし]    
meaning:  alarm  rank: 3☆ 目覚まし
時計 ⇨ An alarm clock  
(☛ An alarm to wake you up only, and doesn’t include a kitchen timer, for example)☆ 
昨夜目覚ましを
掛けるのを
忘れた ⇨ Last night I forgot to set the alarm clock  
(☛ 目覚まし alone implies 目覚まし時計)More examples:- 科学技術はこの百年で目覚ましい進歩を遂げた ⇨ Science and technology have made remarkable advances in the last 100 years
 - 目覚ましを掛けるの忘れて寝過ごしてしまった ⇨ I forgot to set the alarm and overslept
 - その国は目覚ましい復興を遂げた ⇨ The country has made a remarkable recovery