sensor

noun

1
: a device that responds to a physical stimulus (such as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control)
2

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Sensors are used today almost everywhere. Radar guns bounce microwaves off moving cars. A burglar alarm may use a photosensor to detect when a beam of light has been broken, or may use ultrasonic sound waves that bounce off moving objects. Still other sensors may detect pressure (barometers) or chemicals (Breathalyzers and smoke detectors). Stud finders, used by carpenters to locate wooden studs under a wall, may employ magnets or radar. Wired gloves, which relay information about the position of the fingers, are used in virtual-reality environments. A cheap car alarm may be nothing but a shock sensor, in which a strong vibration will cause two metal surfaces to come together.

Examples of sensor in a Sentence

Image sensors are used in digital cameras. Infrared sensors can track an object's movement.
Recent Examples on the Web
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Their infrared sensors detect heat, while finely tuned smoke receptors in their antennae guide them toward the source of the flames. Scott Travers, Forbes, 12 Jan. 2025 Of course, additional trims add equipment, with highlights in the S trim including keyless entry and push-button start, synthetic leather upholstery, a wireless device charging pad and front and rear parking sensors. James Raia, The Mercury News, 12 Jan. 2025 Intelligent navigation: Equipped with high-accuracy sensors, the D9 creates real-time 3D semantic maps of its surroundings. Kurt Knutsson, Cyberguy Report, Fox News, 11 Jan. 2025 The images on the right of the pairs have been taken without the infrared sensor. Daniel R. Depetris, Newsweek, 10 Jan. 2025 See all Example Sentences for sensor 

Word History

Etymology

Latin sentire to perceive + English -or entry 1 — more at sense

First Known Use

circa 1928, in the meaning defined at sense 1

Time Traveler
The first known use of sensor was circa 1928

Dictionary Entries Near sensor

Cite this Entry

“Sensor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sensor. Accessed 18 Jan. 2025.

Kids Definition

sensor

noun
sen·​sor ˈsen-ˌsȯ(ə)r How to pronounce sensor (audio)
ˈsen(t)-sər
: a device that detects a physical quantity (as a movement or a beam of light) and responds by transmitting a signal

Medical Definition

sensor

noun
: a device that responds to a physical stimulus (as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control)
also : sense organ

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