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hydrometer
hydromorphic
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hydroperoxide
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hydrophone
hy·dro·phone [ hdrə fn ] (plural hy·dro·phones)


noun 
Definition:
 
underwater receiver: an electronic receiver that can pick up sound traveling through water by converting acoustic energy into electromagnetic waves. One use is tracking submarines.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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