naphthyridine
/nafˈθɪrɪdiːn/ /napˈθɪrɪdiːn/Chemistry
noun
Any of several isomers with the formula C8H6N2 whose structure is that of naphthalene with one carbon atom in each ring replaced by nitrogen; especially the 1,8-isomer.
Origin
1920s. From German Naphtyridin from Naphta + Pyridin, apparently with simplification of the resulting sequence of consonants -phtpyr-.