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Longman Dictionary of Contemporary English
smoke detector
noun
EXAMPLES FROM CORPUS
▪ By the time it sets off the smoke detector, the corridor is blocked.
▪ Luckily we have a smoke detector on the ceiling in each room.
▪ Three hundred firemen and 400 policemen raced to the Hofburg after a smoke detector set off the alarm soon after midnight.
Wiktionary
smoke detector

n. A device that sounds an alarm when it detects smoke.

Wikipedia
Smoke detector

A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household smoke detectors, also known as smoke alarms, generally issue a local audible or visual alarm from the detector itself.

Smoke detectors are housed in plastic enclosures, typically shaped like a disk about in diameter and thick, but shape and size vary. Smoke can be detected either optically ( photoelectric) or by physical process ( ionization), detectors may use either, or both, methods. Sensitive alarms can be used to detect, and thus deter, smoking in areas where it is banned. Smoke detectors in large commercial, industrial, and residential buildings are usually powered by a central fire alarm system, which is powered by the building power with a battery backup. Domestic smoke detectors range from individual battery-powered units, to several interlinked mains-powered units with battery backup; if any unit detects smoke, all trigger even in the absence of electricity.

The US National Fire Protection Association estimates that nearly two-thirds of deaths from home fires occur in properties without working smoke detectors.

Usage examples of "smoke detector".

The camera was positioned somewhere near the ceiling in a phony smoke detector, Klecker told me later-and the lens was a fisheye, foreshortening the sides of the room much like the gold-framed parabolic mirror that hung in my parents' foyer.

While we're on the subject, I might mention that when your smoke detector begins to beep every few seconds, it means it's time to change the battery, for Chrissake.

Somewhere, a smoke detector screeched, and doors started popping open down the hallway.

Five minutes went by, then ten, and just as I was deciding she had either lost her courage or discovered that the battery of the smoke detector in the toilet was dead, the fire alarm went off in the west wing with a loud, buzzing burr.

I don't know how many puffs it'll take to set off the smoke detector in there, but I intend to find out.

And then both of these things are in me, both real, both clear as can be: the temples on Roy's face throbbing and the little red light on the smoke detector flashing.

I made it to the bathroom, where I splashed water on my eyes, cheeks, and the back of my neck, while making sounds that were not unlike a tin can and a smoke detector achieving simultaneous orgasm.

Her second, after two or three minutes of dozing with her eyes open, was smoke detector.

She realized that what she was hearing didn't really sound very much like a smoke detector at all.

It was a smoke detector -- a gadget which was even newer than microwave ovens back in 1969.

I dont see how you can smoke this much without setting off the smoke detector.

And, in case of trouble, the smoke detector and the burglar alarm, which automatically dialed the police.