from
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]