Tsetse \Tset"se\, n. (Zool.)
A venomous two-winged African fly ({Glossina morsitans})
whose bite is very poisonous, and even fatal, to horses and
cattle, but harmless to men. It renders extensive districts
in which it abounds uninhabitable during certain seasons of
the year. [Written also {tzetze}, and {tsetze}.]
[1913 Webster]