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hydronaut

[hahy-druh-nawt, -not]
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noun
  1. a person trained to work in deep-sea vessels for research and rescue purposes.
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Origin of hydronaut

An Americanism dating back to 1965–70; hydro-1 + (aero)naut
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for hydronaut

hydronaut

noun
  1. US navy a person trained to operate deep submergence vessels
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Word Origin

C20: from Greek, from hydro- + -naut, as in aeronaut, astronaut
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012