hydrospace

American  

[hahy-druh-speys] / ˈhaɪ drəˌspeɪs /

noun

1. the regions beneath the surface of the oceans and seas.

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hydrospace Scientific  

/ hī′drə-spās′ /

1. 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.

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Etymology

Origin of hydrospace

First recorded in 1960–65; hydro- ¹ ( def. ) + space ( def. )