Definition of "abyssal" []

• Abysmal; unfathomable. (adjective)
• Of or relating to the great depths of the oceans. (adjective)
• Of or relating to the region of the ocean bottom between the bathyal and hadal zones, from depths of approximately 3,000 to 6,000 meters (10,000 to 20,000 feet). (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The deepest parts of the ocean are known as the abyssal zone."
• "While neither of these fish and jellies - and there are far too many to name here - are monsters in size, there is something called abyssal gigantism, the tendency for other forms of extremely deep-dwelling organisms to not only be odd, strange, bizarre and darned creepy but also - yes, you guessed it - HUGE. via)"
• "'When you catch him he'll be wearing a double-breasted suit. 'to its abyssal low."