thermophone

/thur-muh-fohn/US // ˈθɜr məˌfoʊn //

热风琴,热风机,热风炉,热风枪

Definitions

n.名词 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.