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bolometer

noun

bo·​lom·​e·​ter bō-ˈlä-mə-tər How to pronounce bolometer (audio)
: a very sensitive thermometer whose electrical resistance varies with temperature and which is used in the detection and measurement of feeble thermal radiation and is especially adapted to the study of infrared spectra
bolometric adjective
bolometrically adverb

Word History

Etymology

Greek bolē stroke, beam of light (from ballein to throw) + English -o- + -meter — more at devil

First Known Use

1878, in the meaning defined above

Time Traveler
The first known use of bolometer was in 1878

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