Top Definition
A term used to describe an individual who explores the depths of the ocean, in similarity to an astronaut who explores the depth of outer space, experiencing almost similar external environmental factors as an astronaut.
When Neil Armstrong did a big leap for mankind as an astronaut on the moon, Sylvia Earle leapt a great deal as an aquanaut in the oceans.
by vivek.b.nair September 18, 2012
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