Arrow-root

arrowroot

[ar-oh-root, -root]
noun
1.
a tropical American plant, Maranta arundinacea, the rhizomes of which yield a nutritious starch.
2.
the starch itself.
3.
any of several other plants yielding a similar starch.
4.
the starch of these plants, used in cooking as a binder or thickener.

Origin:
1690–1700; so called from use of its root in treatment of wounds made by poisoned arrows

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World English Dictionary
arrowroot (ˈærəʊˌruːt)
 
n
1.  a white-flowered West Indian plant, Maranta arundinacea, whose rhizomes yield an easily digestible starch: family Marantaceae
2.  the starch obtained from this plant
3.  any of several other plants whose rhizomes or roots yield starch

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