Bo·na·ci n.  Zool. (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.
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  Mycteroperca bonaci
       n : large dark grouper with a thick head and rough scales [syn:
           jewfish]