The Collaborative International Dictionary of English v.0.48:

Basutos \Ba*su"tos\, n. pl.; sing. Basuto. (Ethnol.)
   A warlike South African people of the Bantu stock, divided
   into many tribes, at one time subjected by the English. They
   formerly practiced cannibalism, but have now adopted many
   European customs.
   [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

Basuto
    n 1: the dialect of Sotho spoken by the Basotho; an official
         language of Lesotho [syn: Sesotho, Basuto]