One of the mysteries of the English language finally explained.
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.
1920s. From German Naphtyridin from Naphta + Pyridin, apparently with simplification of the resulting sequence of consonants -phtpyr-.
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