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shamrock

[sham-rok]
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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.
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Origin of shamrock

1565–75; < Irish seamróg, equivalent to seamair clover + -óg diminutive suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for shamrock

shamrock

noun
  1. a plant having leaves divided into three leaflets, variously identified as the wood sorrel, red clover, white clover, and black medick: the national emblem of Ireland
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Word Origin

C16: from Irish Gaelic seamrōg, diminutive of seamar clover
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for shamrock

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper