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.
  Note: ☞ The name is also applied to other related species, as the leche (Kobus leche), which has similar habits.
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  Kobus leche
       n : tawny-colored African antelope inhabiting wet grassy plains;
           a threatened species [syn: lechwe]