[1] : The Collaborative International Dictionary of English v.0.48

gnu \gnu\, n. hottentot gnu, or nju: cf. f. gnou. zool.
   one of two species of large south african antelopes of the
   genus catoblephas, having a mane and bushy tail, and curved
   horns in both sexes. written also gnoo.
   1913 webster

   note: the common gnu or wildebeest catoblephas gnu is
         plain brown; the brindled gnu or blue wildebeest c.
         gorgon is larger, with transverse stripes of black on
         the neck and shoulders.
         1913 webster
see also:
catoblephas gnoo catoblephas gnu c. gorgon 

Gnu >> G Words
Gnu, definition of term: Gnu
gnu_pag1.html

Catoblephas >> C Words
Catoblephas, definition of term: Catoblephas
catoblephas_pag1.html