Medical Dictionary


noun xan·thop·ter·in \zan-ˈthäp-tə-rən\

Definition of XANTHOPTERIN

:  a yellow crystalline amphoteric pigment C6H5N5O2 that occurs especially in the wings of yellow butterflies and also in the urine of mammals and that is convertible into folic acid by the action of various microorganisms
April 01, 2015
diapause Hear it
a period of physiological dormancy
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears