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n. An electrical instrument for detecting or monitoring sound under water.

n. a transducer that converts underwater sound waves into electrical signals, rather like a microphone

n. An instrument for detecting the flow of water in a pipe (thus locating waste) by the sounds produced in a microphone.

n. An instrument used in auscultation whereby sounds are conveyed through a column of water.

"During some types of gynaecological examination, researchers have inserted a tiny microphone, called a hydrophone, into the uterus, enabling them to hear what the foetus can hear."

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