The Collaborative International Dictionary of English v.0.48:

nyala \nyala\ n. (Zool.)
   A spiral-horned South African antelope (Tragelaphus angasi)
   with a fringe of white hairs along back and neck.

   Syn: Tragelaphus angasi.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Nyala
    n 1: city in Sudan
    2: spiral-horned South African antelope with a fringe of white
       hairs along back and neck [syn: nyala, Tragelaphus
       angasi]