Any of a family of macrocyclic compounds having a structure similar to that of porphyrin; they are blue/green pigments that are used in plastics and enamels
(Kimya) A greenish-blue crystalline porphyrin, C32H18N8; any of its substituted derivatives
(Kimya) Any of the metal chelate complexes of such porphyrins, which form a large class of pigments and dyes ranging in colour from green to blue