Etymology
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Plutonian (adj.)

1660s, "pertaining to the god Pluto," from Latin Plutonius, from Greek Ploutōnius, from Ploutōn "pertaining to Pluto" (see Pluto). Geological sense is from 1828 (see plutonic). Planetary sense by 1952.

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Definitions of Plutonian

Plutonian (adj.)
of or relating to or characteristic of Hades or Tartarus;
Synonyms: Hadean / Tartarean
From wordnet.princeton.edu