/ Dictionary / Index P pityriasis: Meaning and Definition of Find definitions for: pit•y•ri•a•sis Pronunciation: (pit"u-rī'u-sis), [key] — n. any of various skin diseases marked by the shedding of branlike scales of epidermis. a skin disease in various domestic animals marked by dry scales. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pityriasis (Thesaurus) pitying pityroid 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