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.
The air is also in motion, so from moment to moment, the starlight will pass through different parcels on its way to your eye or your detector, shifting position each time, usually randomly because of the air’s turbulent motion. Phil Plait, Scientific American, 15 May 2025 There are many challenges in creating a wearable heart attack detector. Abhimanyu Ghoshal, New Atlas, 11 May 2025 In practice, this is measured by loop detectors embedded in the roadway. Laurie Winkless, Forbes.com, 8 May 2025 Inside the boat, multiple hydrogen detectors keep an eye on gas levels. Kurt Knutsson, Cyberguy Report, FOXNews.com, 22 Apr. 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 3 Jun. 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
Love words? Need even more definitions?

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