ra·​di·​om·​e·​ter | \ ˌrā-dē-ˈä-mə-tər How to pronounce radiometer (audio) \

Definition of radiometer

: an instrument for detecting and usually for measuring the intensity of radiant energy

Illustration of radiometer

Illustration of radiometer

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Other Words from radiometer

radiometry \ ˌrā-​dē-​ˈä-​mə-​trē How to pronounce radiometer (audio) \ noun

Examples of radiometer in a Sentence

Recent Examples on the Web Valero proposed two instruments: a camera called EPIC to image clouds and other climate-influencing factors such as pollution, volcanic ash and seasonal vegetation; and a radiometer named NISTAR to measure the energy coming from Earth. Mark Zastrow, Scientific American, "Al Gore's Dream Spacecraft Gears Up for Launch," 15 Jan. 2015 Every station except for the highest one is outfitted with a net radiometer, an instrument that measures incoming and outgoing radiation, and the lower stations also carry rain gauges and present weather sensors. Maddie Stone, Anchorage Daily News, "World’s highest weather stations reveal intense sunshine may be melting ice on Mount Everest," 13 Dec. 2019 Data from aircraft radiometers, which infer surface wind speed from above by looking at the state of the sea surface. Adam Sobel, New York Times, "What Will Turn Hurricane Dorian? How Wide Is the Eye? Your Questions Answered.," 1 Sep. 2019 In addition to its weighted arm for hopping, MASCOT had a camera, a magnetometer, a radiometer, and infrared spectrometer. John Timmer, Ars Technica, "Tiny robot finds an asteroid that’s freakishly free of dust," 22 Aug. 2019 In 1879, another titan of science, the Scottish physicist James Clerk Maxwell, pointed out that the Navier-Stokes equations fail to explain a near-vacuum experiment called the Crookes radiometer — apparently unbeknownst to Hilbert. Quanta Magazine, "Famous Fluid Equations Are Incomplete," 21 July 2015 In 1879, Maxwell attempted to describe the turning vanes of the Crookes radiometer by modeling the thin air inside the vacuum chamber as a fluid. Quanta Magazine, "Famous Fluid Equations Are Incomplete," 21 July 2015 The lander was carrying four experiments: the MASCAM camera and a radiometer, both made by the DLR; a magnetometer built by the Technical University of Braunschweig; and an infrared spectrometer made by the French space agency, CNES. Megan Gannon,, "'Crazy' Rocky Surface of Asteroid Ryugu Revealed in MASCOT Lander Images," 13 Oct. 2018 The data from the dropsondes is combined with data collected by a device fixed below the right wing called a stepped frequency microwave radiometer, or SFMR, which gauges storm intensity by converting surface brightness into wind speed. Valerie Bauerlein, WSJ, "In a Plane, Flying Through the Eye of Hurricane Florence," 13 Sep. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radiometer.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of radiometer

1875, in the meaning defined above

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Time Traveler for radiometer

Time Traveler

The first known use of radiometer was in 1875

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Cite this Entry

“Radiometer.” Dictionary, Merriam-Webster, Accessed 7 May. 2021.

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More Definitions for radiometer


ra·​di·​om·​e·​ter | \ ˌrād-ē-ˈäm-ət-ər How to pronounce radiometer (audio) \

Medical Definition of radiometer

: an instrument for measuring the intensity of radiant energy also : an instrument for measuring electromagnetic radiation or sound waves

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