[ uhn-der-waw-ter, -wot-er ]
See synonyms for underwater on Thesaurus.com
  1. existing or occurring under water.

  2. designed to be used under water.

  1. located below a ship's waterline.

  1. beneath the water: to travel underwater.

  1. the water beneath the surface: cold currents in the underwater.

  2. underwaters, the depths, as of a sea, lake, etc.

Origin of underwater

First recorded in 1620–30; under- + water

Words Nearby underwater

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use underwater in a sentence

British Dictionary definitions for underwater


/ (ˈʌndəˈwɔːtə) /

  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

  1. (of a stock option or other asset) having a market value below its purchase value

  1. 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