Sentence:  Antioxidants are hot topics in the health news these days, and an herbal tea called <WSD>rooibos</WSD> (pronounced ROY-boss) is becoming popular partly because it is being marketed as a healthy beverage with high levels of antioxidants. The rooibos plant ("Aspalathus linearis" (Burm. f.) Dahlgren, Fabaceae) is a South African flowering shrub used to make a mild-tasting tea that has no caffeine, very little tannin, and significant amounts of polyphenol antioxidants. 
Meaning of the word marked with <WSD> tags:  The tisane (herbal tea) made from this plant.