any of a group of pyrrole derivatives, found in cytoplasm, that combine with iron and magnesium to form heme and chlorophyll, respectively
Origin of porphyrin; from 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 porphura, shellfish yielding purple dye, purple + –in.
From German Porphyrin, shortened from HÃ¤matoporphyrin (“haematoporphyrin").