zanˈthäptərə̇n noun
( -s )
Etymology: xanth- + pter- + -in
: a yellow crystalline amphoteric high-melting pigment H 2 NC 6 HN 4 (OH) 2 that occurs especially in the wings of yellow butterflies and also in the urine of mammals and that is convertible into leucopterin by oxidation and into folic acid by the action of various microorganisms; 2-amino-4,6-dihydroxy-pteridine