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hydronaut

American  
[hahy-druh-nawt, -not] / ˈhaɪ drəˌnɔt, -ˌnɒt /

noun

  1. a person trained to work in deep-sea vessels for research and rescue purposes.

hydronaut British  
/ ˈhaɪdrəʊˌnɔːt /

noun

  1. navy a person trained to operate deep submergence vessels

"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

Etymology

Origin of hydronaut

An Americanism dating back to 1965–70; hydro- 1 + (aero)naut

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.