ther·​mo·​phone | \ ˈthərməˌfōn\

Definition of thermophone 

1 : a portable telethermometer using a telephone in connection with a differential thermometer
2 : a telephone involving heat effects (as changes in temperature) due to pulsations of the line current in a fine wire connected with the receiver diaphragm

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History and Etymology for thermophone

International Scientific Vocabulary therm- + telephone

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