Lady's Thumb Definition

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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