Word Study
terpenylic
CIDE DICTIONARY
terpenylic, a. [Terpene + -yl + -ic.].
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]
For further exploring for "terpenylic" in Webster Dictionary Online