Source : Webster's Revised Unabridged Dictionary (1913)

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.