• (geography) Of or belonging to the ocean depths, especially below 2000 metres (6500 ft): abyssal zone. [First attested in the mid 19th century.]
  • (archaic) Belonging to, or resembling, an abyss; unfathomable. [First attested in the mid 17th century.]
  • (geology) Pertaining to or occurring at excessive depths in the earth's crust; plutonic. [First attested in the late 19th century.]

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