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

1690–1700; so called from use of its root in treatment of wounds made by poisoned arrows Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arrowroot (ˈærəʊˌruːt)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
In sauces, arrowroot seems to work more slowly to thicken than cornstarch.
Novices might not know arrowroot is a common thickener, and that it risks creating an unappealing gumminess to sauces.
We are planting arrowroot along our house so the rainwater that comes off the roof isn't wasted.
The starch of the root is referred to as arrowroot, another useful ingredient in cooking.
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