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Meaning of abyssal

a•byss•al

Pronunciation: (u-bis'ul), [key]
— adj.
  1. of or like an abyss; immeasurable; unfathomable.
  2. 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).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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