arrowroot
n//ˈæɹoʊˌɹut//arrowrot
(countable, uncountable) Maranta arundinacea from the Marantaceae family, a large perennial herb native to the Caribbean area with green leaves about 15 centimeters long. [from late 17th c.]
(uncountable) A starchy substance obtained from the rhizomes of an arrowroot plant used as a thickener.