carbon microphone
noun
A microphone depending for its action on the varying electrical resistance of carbon granules when subjected to the varying pressure of sound waves.
Origin
Late 19th century; earliest use found in Telegraphic Journal.
- pneumohemothorax
- pneumohydrothorax
- pneumokoniotic
- pneumolith
- pneumology
- pneumolysis
- pneumomassage
- pneumomediastinum
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- pneumonokoniotic