underwater

[ uhn-der-waw-ter, -wot-er ]
/ ˈʌn dərˈwɔ tər, -ˈwɒt ər /

adjective

existing or occurring under water.
designed to be used under water.
located below a ship's waterline.

adverb

beneath the water: to travel underwater.

noun

the water beneath the surface: cold currents in the underwater.
underwaters, the depths, as of a sea, lake, etc.

Origin of underwater

First recorded in 1620–30; under- + water
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for underwater

British Dictionary definitions for underwater

underwater

/ (ˈʌndəˈwɔːtə) /

adjective

being, occurring, or going under the surface of the water, esp the seaunderwater exploration
nautical below the water line of a vessel
(of a stock option or other asset) having a market value below its purchase value

adverb

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