Usually means: Explorer specializing in underwater environments.
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We found 7 dictionaries that define the word hydronaut:

General (7 matching dictionaries)
  1. hydronaut: Merriam-Webster
  2. hydronaut: Collins English Dictionary
  3. hydronaut: Wiktionary
  4. hydronaut: Infoplease Dictionary
  5. hydronaut: Dictionary.com
  6. Hydronaut: Wikipedia, the Free Encyclopedia
  7. hydronaut: TheFreeDictionary.com

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Definitions from Wiktionary (hydronaut)

▸ noun:  An undersea explorer, such as a submariner.

Similar:
oceanaut, urinator, scuba diver, terranaut, aqualunger, aqualungist, hydrographer, skin-diver, subwayer, hydraulician, more...

Opposite:
aeronaut, aviator, pilot

▸ Words similar to hydronaut

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Similar:
oceanaut, urinator, scuba diver, terranaut, aqualunger, aqualungist, hydrographer, skin-diver, subwayer, hydraulician, more...

Opposite:
aeronaut, aviator, pilot



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