Definition of ABYSSAL
- of or like an abyss; immeasurable; unfathomable
- of or pertaining to the biogeographic zone of the ocean bottom between the bathyal and hadal zones: from depths of approximately 13,000 to 21,000 ft. (4000 to 6500 m)
- ABYSS, a bottomless chasm [adj]
- very deep [adj]
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