- beneath the water: to travel underwater.
- the water beneath the surface: cold currents in the underwater.
- underwaters, the depths, as of a sea, lake, etc.
Origin of underwater
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for underwater
The fundamental issue: the boundaries of the underwater Lomonosov Ridge.Russia Preps Its North Pole Invasion
November 8, 2014
Theoretically, the ship can take on all comers in the air, sea, underwater or on land.Can the Navy's $12 Billion Stealth Destroyer Stay Afloat?
October 22, 2014
Did something happen to Bob during those few seconds underwater?The Walking Dead’s Most Gruesome Scene Yet: ‘A Man’s Gotta Eat’
October 20, 2014
A few hundred meters upriver, you see groves of date palms swaying as if underwater.Whatever You Do Someone Will Die. A Short Story About Impossible Choices in Iraq
Nathan Bradley Bethea
August 31, 2014
Underwater rover Nereus was lost to the deep last month, and it's not the first.Lost Ocean Rover Leaves Gap in Biology and Alzheimer's Research
June 9, 2014
The mud sucked at it and underwater roots caught on the vanes.Deathworld
When they start shelling from underwater, the Soviets are sure going to be surprised.The Defenders
Philip K. Dick
"Then we won't be able to see what goes on underwater," he told her.
Underwater it was much louder than when it had been received by the Esperance's microphone.
After a long time the normal course of underwater life resumed.The Forgotten Planet
- 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
- beneath the surface of the water
Word Origin and History for underwater
Online Etymology Dictionary, © 2010 Douglas Harper