Belonging to, or resembling, an abyss; unfathomable.
Of or belonging to the ocean depths, especially below 2000 metres (6500 ft): abyssal zone.
Pertaining to or occurring at excessive depths in the earth's crust; plutonic.
First attested in the 1690s. From Medieval Latin abyssalis, from Latin abyssus (“abyss”) + -alis (“-al”). Equivalent to abyss + -al.
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