WordReference Random House Learner's Dictionary of American English © 2017
aq•ua•naut /ˈækwəˌnɔt, -ˌnɑt, ˈɑkwə-/USA pronunciation   n. [countable]
  1. Oceanographya scuba diver who works for an extended period of time in and around a submerged dwelling.

WordReference Random House Unabridged Dictionary of American English © 2017
aq•ua•naut  (akwə nôt′, -not′, äkwə-),USA pronunciation n. 
  1. Oceanographyan undersea explorer, esp. one who skin-dives from or lives for an extended period of time in a submerged dwelling.
  2. Oceanography, Sporta skin-diver.
  • aqua- + -naut, on the model of aeronaut, astronaut, etc. 1880–85


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



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