smoke detector

noun

: an alarm that activates automatically when it detects smoke

called also smoke alarm

Examples of smoke detector in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Check the batteries in your carbon monoxide and smoke detectors. Bebe Hodges, Cincinnati Enquirer, 23 Jan. 2026 In the event of a power outage, stay safe from fire or carbon monoxide poisoning by ensuring your home has working smoke detectors and carbon monoxide detectors. Mary Wasson, Austin American Statesman, 22 Jan. 2026 Dixon also said have working smoke detectors and have a plan to leave the home should a fire happen. Adam Thompson, CBS News, 18 Jan. 2026 The owner racked up a series of building code violations since 2022, including ones for missing smoke detectors, and faulty heating and plumbing systems, Beale said. Brian J. Rogal, Chicago Tribune, 12 Jan. 2026 See All Example Sentences for smoke detector

Word History

First Known Use

circa 1927, in the meaning defined above

Time Traveler
The first known use of smoke detector was circa 1927

Browse Nearby Words

Cite this Entry

“Smoke detector.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/smoke%20detector. Accessed 1 Feb. 2026.

Kids Definition

smoke detector

noun
: an alarm that activates automatically when it detects smoke

called also smoke alarm

More from Merriam-Webster on smoke detector

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!