Sentence:  <WSD>Arrowroot</WSD> ("pia") is a member of the Tacca family. ... The ancient Hawaiians used the <WSD>arrowroot</WSD> ("pia") as a food and as a medicine. 
Meaning of the word marked with <WSD> tags:  "Usually preceded by an (attributive) word": some other plant the rhizomes of which are used to prepare a substance similar to arrowroot "(sense 3)", such as (ver=180620) (Florida arrowroot) or "Pueraria montana" var. "lobata" (Japanese arrowroot or kudzu).