detector

noun

de·​tec·​tor di-ˈtek-tər How to pronounce detector (audio)
: one that detects: such as
a
: a device for detecting the presence of electromagnetic waves or of radioactivity
b
: a rectifier of high-frequency current used especially for extracting the intelligence from a radio signal

Examples of detector in a Sentence

using metal detectors to improve safety at airports a motion detector to thwart burglaries
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.
Last September, a team of researchers from SIO, La Jolla’s J. Craig Venter Institute and other organizations published a study on predicting harmful algae blooms that contain high levels of domoic acid by tracking a single gene that serves like a canary in a coal mine — an early detector of danger. City News Service, San Diego Union-Tribune, 25 Apr. 2025 Each detector is responsible for uncovering information in 17 unique wavelength bands; so altogether, this infrared eye on the sky is able to study the universe in a staggering 102 bands. Monisha Ravisetti, Space.com, 1 Apr. 2025 The Atlanta company has spent hundreds of millions of dollars on the task, from more detectors and inspection technology to a retooling of its training. Atlanta Journal-Constitution, Chicago Tribune, 31 Mar. 2025 Some camera detectors are sensitive to infrared light—not just detectors in JWST but also those in newer smartphones. Phil Plait, Scientific American, 13 Mar. 2025 See All Example Sentences for detector

Word History

First Known Use

1541, in the meaning defined above

Time Traveler
The first known use of detector was in 1541

Browse Nearby Words

Cite this Entry

“Detector.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/detector. Accessed 1 May. 2025.

Kids Definition

detector

noun
de·​tec·​tor di-ˈtek-tər How to pronounce detector (audio)
1
: one that detects or warns
a smoke detector
2
: a device in a radio receiver for changing the high-frequency current of radio waves into current that can vibrate a loudspeaker to reproduce the original sound

Medical Definition

detector

noun
de·​tec·​tor di-ˈtek-tər How to pronounce detector (audio)
: one that detects
especially : a device for detecting the presence of electromagnetic waves or of radioactivity

More from Merriam-Webster on detector

Last Updated: - Updated example sentences
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