Definitions for lady's-thumb
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Random House Webster's College Dictionary
la′dy's-thumb`(n.)
a smartweed, Polygonum persicaria, of the buckwheat family, having pink or purplish flowers and lance-shaped leaves with a spot resembling a thumbprint.
Category: Plants
Origin of lady's-thumb:
1830–40, Amer.
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"lady's-thumb." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/lady's-thumb>.