lüˈkäptərə̇n noun
Etymology: International Scientific Vocabulary leuc- + pterin
: a crystalline alkali-soluble compound H 2 NC 6 N 4 (OH) 3 that constitutes the white pigment of cabbage butterflies and other lepidoptera and wasps and is convertible into xanthopterin on reduction; 2-amino-4,6,7-trihydroxy-pteridine