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.
Hotel chains are installing sophisticated sensor networks that go far beyond traditional smoke detectors. Christopher Elliott, USA Today, 9 Sep. 2025 The same is true for smoke detectors and sprinkler systems. Dan Avery,liz Knueven, CNBC, 26 Aug. 2025 Many smoke detectors contain about 1 microcurie, or 37,000 becquerels, of americium-241, which is below the exception limit of 5 µCi (185,000 Bq). IEEE Spectrum, 25 Aug. 2025 Thompson is also accused of breaking into her home and replacing the smoke detectors with hidden cameras. Rick Sobey, Boston Herald, 22 Aug. 2025 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

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Cite this Entry

“Smoke detector.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/smoke%20detector. Accessed 12 Sep. 2025.

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
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