Entry 1 sense Webster, 1913 Graminivorous · Gram·i·niv·o·rous · IPA /ɡɹæmɪˈnɪvəɹəs/ 01 a. Feeding or subsisting on grass, and the like food; -- said of horses, cattle, and other animals. 1. Feeding or subsisting on grass, and the like food; -- said of horses, cattle, and other animals.