Sentence:  The blaubok, or <WSD>bluebuck</WSD>, was an antelope of the same genus as the roan and the sable; it was eliminated before 1800, primarily because the settlers took over the animal's grazing land for their cattle. 
Meaning of the word marked with <WSD> tags:  An extinct mammal, (noshow=1), the first large African mammal to become extinct in historical times ("circa" 1800).