Definition of "underwater" []

• Relating to, occurring, used, or performed beneath the surface of water. (adjective)
• Nautical Below the water line of a vessel. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Sora, one of the boys who has the ability to survive underwater, is missing from the hospital."
• "But, when you add in underwater work, heavy CGI work and wire work, it becomes extraordinarily complicated."
• "It was a tall round shape made of smooth glass, and it was tied with a fishing line, Orphan discovered, to a rusting hook that protruded underwater from the side of the embankment."