WordReference Random House Learner's Dictionary of American English © 2025un•der•wa•ter /ˈʌndɚˈwɔtɚ, -ˈwɑtɚ/USA pronunciation
adj.
- existing or occurring under water.
- designed to be used under water:underwater cameras and lights.
adv.
- beneath the water:to travel underwater.
WordReference Random House Unabridged Dictionary of American English © 2025un•der•wa•ter
(un′dər wô′tər, -wot′ər),USA pronunciation adj.
- existing or occurring under water.
- designed to be used under water.
- located below a ship's waterline.
adv.
- beneath the water:to travel underwater.
n.
- the water beneath the surface:cold currents in the underwater.
- underwaters, the depths, as of a sea, lake, etc.
Collins Concise English Dictionary © HarperCollins Publishers::
underwater / ˈʌndəˈwɔːtə/ - being, occurring, or going under the surface of the water, esp the sea: underwater exploration
- below the water line of a vessel
- beneath the surface of the water
'underwater' also found in these entries (note: many are not synonyms or translations):