Hydro-phone

hydrophone

[hahy-druh-fohn]
noun
1.
a device for locating sources of sound under water, as for detecting submarines by the noise of their engines.
2.
an instrument employing the principles of the microphone, used to detect the flow of water through a pipe.
3.
Medicine/Medical. an instrument used in auscultation, whereby sounds are intensified through a column of water.

Origin:
1855–60; hydro-1 + -phone

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
hydrophone (ˈhaɪdrəˌfəʊn)
 
n
an electroacoustic transducer that converts sound or ultrasonic waves travelling through water into electrical oscillations

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hydrophone   (hī'drə-fōn')  Pronunciation Key 
A device used to detect or monitor sound under water. Hydrophones are often installed or towed in arrays that can be used to pinpoint a sound source or provide sea-floor imaging as part of a sonar system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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