ˈgalēə̇n, ˈgȯl- noun
( -s )
Etymology: International Scientific Vocabulary gall- + phthal ein; originally formed in German
: a metallic-green crystalline phthalein dye C 20 H 12 O 7 made from phthalic anhydride and gallic acid or pyrogallol and used especially in dyeing violet and as an indicator