Sentence:  Archaeological evidence suggests that economies based on cattle, goats, <WSD>sorghum</WSD>, and pearl millet were established in this region between 5,000 and 3,000 years ago (Smith 1998). 
Meaning of the word marked with <WSD> tags:  A cereal, "Sorghum bicolor" (syn. (noshow=1)) the grains of which are used to make flour and as cattle feed.