pterin
noun
pter·in ˈter-ən 
: any of various compounds that contain the bicyclic ring system characteristic of pteridine
Word History
Etymology
International Scientific Vocabulary pter- (from Greek pteron wing) + -in entry 1; from its being a factor in the pigments of butterfly wings
First Known Use
1934, in the meaning defined above
Medical Definition
pterin
noun
pter·in ˈter-ən
: any of various compounds that contain the bicyclic ring system characteristic of pteridine