Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An explorer in a submarine.
  • noun Someone who lives or works underwater, for scientific reasons.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a skilled worker who can live in underwater installations and participate in scientific research

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[ocea(n) + –naut.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

ocean +‎ -naut, also from astronaut.

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