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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Encyclopedia Britannica
Encyclopedia

hydrophone

device for converting sound waves into electrical signals, similar in operation to a microphone but used primarily for detecting sound waves from an underwater source, such as a submarine. Usually an array of hydrophones is employed to pinpoint the source: the array is connected to an electrical circuit that permits the phase differences of the sound waves at the various hydrophones to be compensated electrically. Thus, the whole array can be "steered" in the direction of the sound source without actual motion of the hydrophones.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Tagged sharks were tracked for an hour or two a day using a hydrophone, an underwater microphone, hung over the side of a boat.
The hydrophone stations will record pressure variations in the ocean.
Holes in the faring permit attachment to hydrophone body and allow water to flood the space between the hydrophone and the faring.
Simultaneously, observations of the underwater sound field along the survey track are made using a towed hydrophone array.
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