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 feet (4000 to 6500 meters).

1685–95; < Medieval Latin abyssālis. See abyss, -al1

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World English Dictionary
abyssal (əˈbɪsəl)
1.  of or belonging to the ocean depths, esp below 2000 metres (6500 feet): abyssal zone
2.  geology another word for plutonic

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1690s, used especially of the zone of ocean water below 300 fathoms, from abyss.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
abyssal   (ə-bĭs'əl)  Pronunciation Key 
  1. Relating to the greatest depths of the oceans and to the organisms that live there. The abyssal zone encompasses all depths below 4,000 m (13,120 ft).

  2. Relating to the region of the ocean bottom between the bathyal and hadal zones, from depths of approximately 2,000 to 6,000 m (6,560 to 19,680 ft). The abyssal zone includes nearly two-thirds of the Earth's surface.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
From the abyssal depths to the tropical shallows, the ocean teems with myriad
The abyssal plains of the world ocean floors are not nearly as deep as that.
For instance, abyssal grenadier fish were confined to valleys on either side of
  the ridge.
There is a census of coastal waters and a census of the abyssal plains, a
  census of coral reefs and a census of seamounts.
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