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.