abyssal

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abyssal

A romantic term equal to an ocean depth of -200 to -700 metres
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

abyssal

(of organisms) inhabiting deep water below 1000 m.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005