wood sorrel

any of numerous plants of the genus Oxalis, especially O. acetosella, of Eurasia, having heart-shaped, trifoliolate leaves and white, pink-veined flowers.

1515–25; translation of French sorrel de bois; replacing woodsour, so called from sour taste of the leaves

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World English Dictionary
wood sorrel
a Eurasian plant, Oxalis acetosella, having trifoliate leaves, an underground creeping stem, and white purple-veined flowers: family Oxalidaceae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica

wood sorrel

any plant of the genus Oxalis, numbering several hundred species, within the family Oxalidaceae. The name is chiefly used for O. montana, a stemless trifoliate (i.e., with three leaflets) herb native to North America from southern Canada southward to Tennessee and westward to Minnesota. It grows about 15 cm (6 inches) tall, has pink-tinted stems, and white or reddish flowers that appear from May until August.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Seeds of touch-me-not and wood sorrel are among the staple foods.
Wood sorrel is a forest species and typically not found in aquatic habitats.
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