/ Dictionary / Index P psorosis: Meaning and Definition of Find definitions for: pso•ro•sis Pronunciation: (su-rō'sis), [key] — n. Plant Pathol. a disease of citrus trees, characterized by a scaly, rough bark, yellow-flecked leaves, and stunting, caused by a virus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. psoriasis PSRO Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language