1855 W. Odling tr. A. Laurent iv. 309 The pyridic, phenic, toluic, xylenic, mesytic, and cymenic series.
1887 A. M. Brown ii. iii. 93 A base which seems to belong to the pyridic group.
1992 114 8636/2 The..total electron populations are nearly constant for pyridic..and amino-group..nitrogens.