Definition of arrowroot
1a
: 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
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Merriam-Webster unabridged
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Time Traveler for arrowroot
The first known use of arrowroot was in 1681
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