owned by or resembling an abyss unfathomable
- associated with ocean depths from 2000 to 5000 meters
- resembling an abyss detailed; therefore deep regarding be unmeasurable
- owned by, or resembling, an abyss; unfathomable.
1690s, used especially associated with zone of ocean water below 300 fathoms, from abyss + -al (1). Although the 19th century, abysmal ended up being more prevalent in oceanography.
- abyssal zone
(a.) owned by, or resembling, an abyss; unfathomable.
Thus red clay and radiolarian ooze are distinguished as abyssal deposits in contradistinction to the epilophic calcareous oozes.