Definition of arrowroot
1 a
: any of a genus (Maranta of the family Marantaceae, the arrowroot family) of tropical American plants with tuberous roots;
especially
: one (M. arundinacea) whose roots yield an easily digested edible starch
b
: any of several plants (such as coontie) that yield starch
2
: starch yielded by an arrowroot
