Definition of "aquanaut" []

• A scuba diver trained to work in underwater installations and conduct, assist in, or be a subject of scientific research. Also called oceanaut. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "One little boy asked Scott Carpenter how his experiences as an "aquanaut" living inside the experimental underwater habitat Sealab compared to his experiences orbiting the Earth as an astronaut."
• "The isolation and constrained aquanaut quarters, the harsh environment there are significant risks associated with working underwater, and reduced gravity presents challenges similar to those that will be encountered during a deep space mission."
• "International Space Station crew member, is leading the aquanaut team."