The Collaborative International Dictionary of English v.0.48:

Zulus \Zu"lus\ (z[=oo]"l[=oo]z), prop. n. pl.; sing. Zulu
   (z[=oo]"l[=oo]). (Ethnol.)
   The most important tribe belonging to the Kaffir race. They
   inhabit a region on the southeast coast of Africa, but
   formerly occupied a much more extensive country. They are
   noted for their warlike disposition, courage, and military
   skill.
   [1913 Webster]