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
Cite this Entry
“Lady's thumb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lady%27s%20thumb. Accessed 30 Oct. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share