WordReference Random House Learner's Dictionary of American English © 2014
aq•ua•naut /ˈækwəˌnɔt, -ˌnɑt, ˈɑkwə-/USA pronunciation  n. [countable]

    a scuba diver who works for an extended period of time in and around a submerged dwelling.

Collins Concise English Dictionary © HarperCollins Publishers::

aquanaut /ˈækwənɔːt/ n
  1. a person who lives and works underwater
  2. a person who swims or dives underwater
Etymology: 20th Century: from aqua + -naut, as in astronaut

'aquanaut' also found in these entries:
In the English description:

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