1) Fish 
• (n.) A large fresh-water food fish of South America.
A`ra·pai'ma noun [ Prob. native name.] (Zoology) A large fresh-water food fish of South America. 
Arapaima is a genus of South American fresh-water fishes, of the order Physostomi, family Osteogiossidae, one species of which (Aeapaima gigas) grows to the length of five meters, and forms a valuable article of food in Brazil and Guiana. It is covered with large bony scales, and has a bare and bony head.
a large freshwater fish, Arapaima gigas, of Brazil and Guiana, reputed to reach a length of 15 ft. (4.5 m) and a weight of 500 lb. (225 kg).