Source : Webster's Revised Unabridged Dictionary (1913)

Water buck \Wa"ter buck`\ (Zo["o]l.)
   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.

Buck \Buck\, n. [OE. buk, bucke, AS. bucca, bua, he-goat; akin
   to D. bok, OHG. pocch, G. bock, Ir. boc, W. bwch, Corn. byk;
   cf. Zend b?za, Skr. bukka. [root]256. Cf. {Butcher}, n.]
   1. The male of deer, especially fallow deer and antelopes, or
      of goats, sheep, hares, and rabbits.

   Note: A male fallow deer is called a fawn in his first year;
         a pricket in his second; a sorel in his third; a sore
         in his fourth; a buck of the first head in his fifth;
         and a great buck in his sixth. The female of the fallow
         deer is termed a doe. The male of the red deer is
         termed a stag or hart and not a buck, and the female is
         called a hind. --Brande & C.

   2. A gay, dashing young fellow; a fop; a dandy.

            The leading bucks of the day.         --Thackeray.

   3. A male Indian or negro. [Colloq. U.S.]

   Note: The word buck is much used in composition for the names
         of antelopes; as, bush buck, spring buck.

   {Blue buck}. See under {Blue}.

   {Water buck}, a South African variety of antelope ({Kobus
      ellipsiprymnus}). See Illust. of {Antelope}.