abyssal Meaning, Definition & Usage
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adjective relating to ocean depths from 2000 to 5000 meters
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adjective satellite resembling an abyss in depth; so deep as to be unmeasurable
unfathomable; abysmal.
- the abyssal depths of the ocean
WordNet
A*byss"al adjective
Etymology
Cf.Definitions
Belonging to, or resembling, an abyss; unfathomable.