The Collaborative International Dictionary
Isonicotinic
Isonicotinic \I`so*nic`o*tin"ic\, a. (Chem.)
Pertaining to, or derived from, isonicotine.
Pertaining to, or designating, an acid isomeric with nicotinic acid.
Wiktionary
isonicotinic
a. 1 Of or pertaining to isonicotine 2 Of or pertaining to isonicotinic acid or its derivatives