Terpenylic \Ter`pe*nyl"ic\, a. [Terpene + -yl + -ic.] (Chem.)
Of, pertaining to, or designating, an acid, {C8H12O4} (called
also terpentic acid), homologous with terebic acid, and
obtained as a white crystalline substance by the oxidation of
oil of turpentine with chromic acid.
[1913 Webster]