The 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 ( -ios , suffix forming adjectives ) . The English word is cognate with Middle French plutonien (modern French plutonien ). The noun is derived from the adjective.
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From Pluto ( “ dwarf planet in the Solar System ” ) + -n- + -ian ( suffix forming adjectives meaning ‘from, related to, or like’, or nouns meaning ‘one belonging to, relating to, or like’ ) , probably influenced by Plutonian ( “ of or relating to Pluto, Greek and Roman god of the underworld ” ) ( see etymology 1 ).
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