an electronic fire alarm that is activated by the presence of smoke.
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How Do You Use A Hyphen?The hyphen, along with its cousins the en and em dash, may be the most misunderstood punctuation mark in English. Hyphens are used to join parts of a word or compound phrase, as in ex-wife, full-length mirror, and by-the-book negotiations. As the Chicago Manual of Style puts it, “Far and away the most common spelling questions for writers and editors concern compound terms—whether to spell …
Origin of smoke detector
First recorded in 1925–30
Also called smoke alarm.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019