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thermophone

[thur-muh-fohn] /ˈθɜr məˌfoʊn/
noun
1.
an electroacoustic transducer that forms sound waves by the expansion and contraction of the air adjacent to a conductor that varies in temperature according to the magnitude of the current passing through it; formerly used to calibrate microphones.
Origin
1875-1880
1875-80; thermo- + -phone
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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