Bonaci \Bo`na*ci"\, n. [Amer. Sp. bonas['i], prob. from native name.] (Zo["o]l.) (a) A large grouper ({Mycteroperca bonaci}) of Florida and the West Indies, valuable as a food fish; -- called also {aguaji} and, in Florida, {black grouper}. (b) Also, any one of several other similar fishes.