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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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

On Monday, it was piloted by Anatoly Sagalevich, the director of the technical council of the preservation foundation, who invited Cameron on his first visit to Lake Baikal and gave him a hardy "hydronaut's" watch.

From Reuters

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.