noun
Standard word for an alarm clock; used in everyday contexts.
目覚まし時計をセットしてから寝た。
I set the alarm clock before going to bed.
今朝は目覚まし時計が鳴らなかった。
The alarm clock didn't go off this morning.
Standard kanji spelling; high priority.
Variant spelling with 覚し instead of 覚まし; less common but still encountered.
Compound of 目覚まし (めざまし, 'waking up') + 時計 (とけい, 'clock'). The reading どけい is a rendaku form of とけい.