hydrospace

[ hahy-druh-speys ]
/ ˈhaɪ drəˌspeɪs /

noun

the regions beneath the surface of the oceans and seas.

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Origin of hydrospace

First recorded in 1960–65; hydro-1 + space
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for hydrospace

hydrospace
[ hīdrə-spās′ ]

The regions beneath the ocean's surface, especially when considered as an area to be studied, as in marine mammal research or sonar mapping of the ocean floor.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.