/ Dictionary / Index P parkinsonian: Meaning and Definition of Find definitions for: par•kin•so•ni•an Pronunciation: (pär"kin-sō'nē-un), [key] — adj. Pathol. of, related to, or resembling parkinsonism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Parkinson parkinsonism Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language