'Zebu' definitions:

Definition of 'zebu'

noun

Domesticated ox having a humped back and long horns and a large dewlap; used chiefly as a draft animal in India and east Asia

From: GCIDE

Zebu \Ze"bu\, n. [?. z['e]bu; of uncertain origin.] (Zool.) A bovine mammal (Ros Indicus) extensively domesticated in India, China, the East Indies, and East Africa. It usually has short horns, large pendulous ears, slender legs, a large dewlap, and a large, prominent hump over the shoulders; but these characters vary in different domestic breeds, which range in size from that of the common ox to that of a large mastiff. [1913 Webster]
Note: Some of the varieties are used as beasts of burden, and some fore for riding, while others are raised for their milk and flesh. The Brahmin bull, regarded as sacred by the Hindoos, also belongs to this species. The male is called also Indian bull, Indian ox, Madras ox, and sacred bull. [1913 Webster]