aquanaut

[ ak-wuh-nawt, -not, ah-kwuh- ]
/ ˈæk wəˌnɔt, -ˌnɒt, ˈɑ kwə- /

noun

an undersea explorer, especially one who skin-dives from or lives for an extended period of time in a submerged dwelling.
a skin-diver.

Origin of aquanaut

1880–85; aqua- + -naut, on the model of aeronaut, astronaut, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for aquanaut

aquanaut

/ (ˈækwənɔːt) /

noun

a person who lives and works underwater
a person who swims or dives underwater

Word Origin for aquanaut

C20: from aqua + -naut, as in 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