fire alarm 
noun
A device making a loud noise that gives warning of a fire: a fire alarm went off and the building had to be evacuated...
- This time the ringing noise wasn't the fire alarm, but the dinner bell.
- That was when the idiots decided to test the fire alarm without the usual warning over the speakers.
- One girl bolted to the fire alarm and pulled it, setting the siren wailing and then sprinting for the door.
- equipotential
- equipper
- equiprobability
- equiprobable
- equisetum
- equitability
- equitable
- equitableness
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- equity of redemption
- equity release
- equity stock
- equiv.
- equivalence
- equivalence class
- equivalence principle
- equivalence relation
- equivalency
- equivalent
- equivalently
- equivalent weight