lady's thumb
noun
: a widely distributed weedy annual herb (Polygonum persicaria) of the buckwheat family that has large lanceolate leaves often with a blackish blotch suggesting a thumbprint
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“Lady's thumb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lady%27s%20thumb. Accessed 15 Dec. 2024.
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