fire alarm

smoke detector, device that detects smoke from a fire and emits a danger signal; danger signal warning of a fire

A fire alarm system is an active fire protection system that detects fire or the effects of fire, and as a result provides one or more of the following: notifies the occupants, notifies persons in the surrounding area, summons the fire service, and controls all the fire alarm components in a building. Fire alarm systems can include alarm initiating devices, alarm notification appliances, control units, fire safety control devices, annunciators, power supplies, and wiring.
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Noun
1. a shout or bell to warn that fire has broken out
(hypernym) alarm, alert, warning signal, alarum
2. an alarm that is tripped off by fire or smoke
(synonym) smoke alarm
(hypernym) alarm, warning device, alarm system

fire-alarm /'faiərə,lɑ:m/
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