Meaning of porphyrin

por•phy•rin

Pronunciation: (pôr'fu-rin), [key]
— n. Biochem.
  1. a dark red, photosensitive pigment consisting of four pyrrole rings linked by single carbon atoms: a component of chlorophyll, heme, and vitamin B.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: