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  1. Pertaining to an igneous intrusion that occurs at considerable depth, or to the resulting rock; plutonic. CF: hypabyssal
  2. Pertaining to the ocean environment or depth zone of 500 fathoms (3,000 ft or 915 m) or deeper; also, pertaining to the organisms of that environment. AGI
  3. Of, or pertaining to, deep within the Earth, the oceanic deeps below 1,000 fathoms (6,000 ft or 1.83 km), or great depths of seas or lakes where light is absent. See also: plutonic
  4. In oceanography, relating to the greatest depths of the ocean; relating to the abyssal realm. Syn: abysmal
    Source: Dictionary of Mining, Mineral, and Related Terms

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