Sentence:  Previously flexible relations of production were transformed into ethnic categories defined by criteria of race, language, and economic status. Although self-referent names of Khoisan-speaking peoples (Zhu, <WSD>Gcwi</WSD>, Gxana, Deti, Qoo, and a dozen others) continue ... 
Meaning of the word marked with <WSD> tags:  A certain ethnic group in Africa.