wood sorrel
noun
: any of a genus (Oxalis of the family Oxalidaceae, the wood-sorrel family) of herbs with acid sap, compound leaves, and regular flowers having five usually white, purple, or yellow petals
especially
: either of two stemless herbs (O. montana of North America and O. acetosella of Eurasia) with trifoliolate leaves
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Merriam-Webster unabridged
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