any of a group of pyrrole derivatives, found in cytoplasm, that combine with iron and magnesium to form heme and chlorophyll, respectively
Origin of porphyrinfrom Classical Greek porphyra, purple + -in
Any of various organic compounds containing four pyrrole rings, occurring universally in protoplasm, and functioning as a metal-binding cofactor in hemoglobin, chlorophyll, and certain enzymes.
Origin of porphyrinGreek porphurā purple dye, purple garment ; see purple . -in
From German Porphyrin, shortened from HÃ¤matoporphyrin (“haematoporphyrin").