Shamrock (noun)
shamrock [sham-rok]
noun
1. any of several trifoliate plants, as the wood sorrel, Oxalis acetosella, or a small, pink-flowered clover, Trifolium repens minus, but especially Trifolium procumbens, a small, yellow-flowered clover: the national emblem of Ireland.
Origin: 1565-75; < Irish seamróg, equivalent to seamair clover + -óg diminutive suffix
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Happy St. Patrick's Day!