thermophone

[ thur-muh-fohn ]
/ ˈθɜr məˌfoʊn /

noun

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 of thermophone

First recorded in 1875–80; thermo- + -phone

Words nearby thermophone

thermoperiodic, thermoperiodicity, thermoperiodism, thermophile, thermophilic, thermophone, thermophore, thermophosphorescence, thermophylic, thermopile, thermoplacentography