Definition of underwater adjective from the Oxford Advanced American Dictionary

  

underwater

 adjective
adjective
NAmE//ˌʌndərˈwɔt̮ər//
 
, NAmE//ˌʌndərˈwɑt̮ər//
 
[only before noun]
 
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 found, used, or happening below the surface of water underwater creatures an underwater camera
underwateradverb
 
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Take a deep breath and see how long you can stay underwater.