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alum root

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al⋅um⋅root

[al-uhm-root, -root]
–noun
1. any of several North American plants belonging to the genus Heuchera, of the saxifrage family, esp. H. americana, having mottled foliage and greenish-white flowers.
2. the root of any of these plants, used as an astringent.

Origin:
1805–15, Americanism; alum 1 + root 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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