Tset"se, n. (Zoöl.) 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.]

Tset"se, n. (Zoöl.) 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.]

• (entomology, South African English) Any fly of the genus Glossina, native to Africa, that feeds on human and animal blood and transmits the parasitic trypanosomes.