from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See aquanaut.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An explorer in a submarine.
- n. Someone who lives or works underwater, for scientific reasons.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a skilled worker who can live in underwater installations and participate in scientific research
ocean + -naut, also from astronaut. (Wiktionary)
When I was a child I read a story about an oceanaut who followed a rope to the bottom of the sea.