The Collaborative International Dictionary of English v.0.48:

Toluic \To*lu"ic\, a. (Chem.)
   Pertaining to, or designating, one of three metameric acids,
   CH3.C6H4.CO2H, which are related to toluene and analogous
   to benzoic acids. They are white crystalline substances, and
   are called respectively orthotoluic acid, metatoluic
   acid, and paratoluic acid.
   [1913 Webster]