Hypertext Webster Gateway: "Abyssal"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Abyssal \A*byss"al\, a. [Cf. {Abysmal}.]
Belonging to, or resembling, an abyss; unfathomable.
{Abyssal zone} (Phys. Geog.), one of the belts or zones into
which Sir E. Forbes divides the bottom of the sea in
describing its plants, animals, etc. It is the one
furthest from the shore, embracing all beyond one hundred
fathoms deep. Hence, abyssal animals, plants, etc.
From WordNet (r) 1.7 (wn)
abyssal
adj 1: relating to ocean depths from 2000 to 5000 meters
2: so deep as to be unmeasurable; unfathomable; "the abyssal
depths of the ocean" [syn: {abysmal}]
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