Lady's Thumb Definition
lādēzthum
noun
An annual plant (Polygonum persicaria) of the buckwheat family, with dense spikes of pinkish or purplish flowers.
Webster's New World
Origin of Lady's Thumb
Possibly from the belief that the blotch was left by the Virgin Mary when she pinched a leaf and rejected it while looking for water pepper, a similar plant that lacks the blotch and is used as a condiment
From American Heritage Dictionary of the English Language, 5th Edition
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