/ Dictionary / Index P porphyria: Meaning and Definition of Find definitions for: por•phyr•i•a Pronunciation: (pôr-fēr'ē-u, -fī'rē-u), [key] — n. Pathol. a defect of blood pigment metabolism in which porphyrins are produced in excess, are present in the blood, and are found in the urine. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: porphyria (Thesaurus) porous porphyrin Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language