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From The Collaborative International Dictionary of English v.0.48:
Water buck \Wa"ter buck`\ (Zool.) A large, heavy antelope (Kobus ellipsiprymnus) native of Central Africa. It frequents the banks of rivers and is a good swimmer. It has a white ring around the rump. Called also photomok, water antelope, and waterbok. [1913 Webster] Note: The name is also applied to other related species, as the leche (Kobus leche), which has similar habits. [1913 Webster]