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shamrock (n.)

1570s, from Irish seamrog, diminutive of seamar "clover." Compare Gaelic seamrag "trefoil."

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Definitions of shamrock from WordNet

shamrock (n.)
creeping European clover having white to pink flowers and bright green leaves; naturalized in United States; widely grown for forage;
Synonyms: white clover / dutch clover / Trifolium repens
shamrock (n.)
Eurasian plant with heart-shaped trifoliate leaves and white purple-veined flowers;
Synonyms: common wood sorrel / cuckoo bread / Oxalis acetosella
shamrock (n.)
clover native to Ireland with yellowish flowers; often considered the true or original shamrock;
Synonyms: hop clover / lesser yellow trefoil / Trifolium dubium
From wordnet.princeton.edu