/thal'euh suy"euh neen', -nin, fthal'-/ , n. Chem.
1. Also called metal-free phthalocyanine . a blue-green pigment, C 32 H 18 N 8 , derived from phthalic anhydride.
2. any of the group of blue or green pigments produced by the interaction of metal-free phthalocyanine and a metal, esp. copper: used chiefly in the manufacture of enamels, printing inks, and automotive finishes.
[ 1930-35; (NA)PHTHAL(ENE) + -O- + CYANINE ]