arrowroot

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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.

noun

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

n.

1690s, from arrow + root (n.). So called because it was used to absorb toxins from poison-dart wounds.

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