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.

Nearby words

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

Origin of thermophone

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