You searched for: “thermophone”
thermophone
In acoustical engineering, a transducer that converts electrical energy (produced by driving an alternating current superimposed on a direct current) into heat by the dissipation of energy in a resistive element, thereby producing sound.
This entry is located in the following units: phon-, phono-, -phone, -phonia, -phonic, -phonetic, -phonous, -phonically, -phonetically, -phony + (page 20) thermo-, therm-, thermi-, -thermia, -therm, -thermal, -thermic, -thermias, -thermies, -thermous, -thermy (page 30)