/ Dictionary / Index P Plutonian: Meaning and Definition of Find definitions for: Plu•to•ni•an Pronunciation: (pl-tō'nē-un), [key] — adj. of, pertaining to, or resembling Pluto or the lower world; infernal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plutonian (Thesaurus) pluton plutonic Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language