Sentence:  &#91;[https://books.google.com/books?id=QT1HAQAAMAAJ&pg=PA396 page 396]&#93; <WSD>Arrowroot</WSD> is the fecula of "Maran′ta arundina′cea" or "West Indian arrowroot"; smallcaps 
Meaning of the word marked with <WSD> tags:  A starchy substance obtained from the rhizomes of an arrowroot plant used as a thickener.