Definition of phthalocyanine
noun [mass noun] Chemistry
a greenish-blue crystalline dye of the porphyrin group.
- Chemical formula: C32H18N8
[count noun] any of a large class of green or blue pigments and dyes which are chelate complexes of phthalocyanine or one of its derivatives with a metal (in particular, copper): [as modifier]:phthalocyanine blue