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Shamrock, popular name in Ireland for several leguminous plants, the trifoliate leaves of which were cited by St. Patrick as a symbol of the Christian Trinity. Among the plants called shamrock are the wood sorrel (Oxalis acetosella), white clover (Trifolium repens), and black medic (Medicago lupulina).

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Serum to Singing