/ Dictionary / Index P PSRO: Meaning and Definition of Find definitions for: PSRO Pronunciation: [key] Professional Standards Review Organization. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. psorosis P.SS. Related Content Daily Word Quiz: designate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language