smoke alarm
also smoke detector
Word forms: smoke alarms
countable noun B1+
A smoke alarm or a smoke detector is a device fixed to the ceiling of a room which makes a loud noise if there is smoke in the air, to warn people.
His smoke detector did go off which shows the importance of working smoke alarms.
Image of smoke alarm
© Aleksandra Pikalova, Shutterstock
Translations:
Chinese: 烟雾报警器
Japanese: 煙警報器