Source : Webster's Revised Unabridged Dictionary (1913)

Duykerbok \Duy"ker*bok\, n. [D. duiker diver + bok a buck, lit.,
   diver buck. So named from its habit of diving suddenly into
   the bush.] (Zo["o]l.)
   A small South African antelope ({Cephalous mergens}); --
   called also {impoon}, and {deloo}.