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underwater

[uhn-der-waw-ter, -wot-er] /ˈʌn dərˈwɔ tər, -ˈwɒt ər/
adjective
1.
existing or occurring under water.
2.
designed to be used under water.
3.
located below a ship's waterline.
adverb
4.
beneath the water:
to travel underwater.
noun
5.
the water beneath the surface:
cold currents in the underwater.
6.
underwaters, the depths, as of a sea, lake, etc.
Origin
1620-1630
1620-30; under- + water
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for under water

underwater

/ˈʌndəˈwɔːtə/
adjective
1.
being, occurring, or going under the surface of the water, esp the sea: underwater exploration
2.
(nautical) below the water line of a vessel
3.
(of a stock option or other asset) having a market value below its purchase value
adverb
4.
beneath the surface of the water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for under water

underwater

adj.

1620s, from under + water (n.). Of mortgages from 2008.

Online Etymology Dictionary, © 2010 Douglas Harper
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