Meaning

adjective of or relating to or characteristic of Hades or Tartarus

originThe adjective is derived from Latin Plūtōnius (“of or relating to Pluto, Greek and Roman god of the underworld”) + -an (suffix forming adjectives). Plūtōnius is from Ancient Greek Πλουτώνιος (Ploutṓnios, “of or relating to Pluto”), from Πλούτων (Ploútōn, “Pluto”) (from πλοῦτος (ploûtos, “riches, wealth”) (ultimately from Proto-Indo-European *plew- (“to fly; to flow; to run”)) + -ων (-ōn)) + -ιος…

Etymology from Wiktionary, CC BY-SA 3.0