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hydrophobia
hydrophobic
hydrophone
hydrophyte
hydroplane
hydroponics
hydropower
hydroquinone
hydroscope
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hydroski
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hydroscope
hy·dro·scope [ hdrə skp ] (plural hy·dro·scopes)


noun 
Definition:
 
underwater optical instrument: an optical instrument constructed from a series of mirrors encased in a tube, used for observing objects deep beneath the surface of a body of water

hy·dro·scop·ic [ hdrə skóppik ] adjective
hy·dro·scop·i·cal [ hdrə skóppik'l ] adjective
hy·dro·scop·i·cal·ly [ hdrə skóppikəlee ] adverb
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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