shamrock

[sham-rok]
noun
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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Collins
World English Dictionary
shamrock (ˈʃæmˌrɒk)
 
n
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
 
[C16: from Irish Gaelic seamrōg, diminutive of seamar clover]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

shamrock
1571, from Ir. seamrog, dim. of seamar "clover."
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica
Encyclopedia

shamrock

any of several similar-appearing trifoliate plants-i.e., plants each of whose leaves is divided into three leaflets. Plants called shamrock include the wood sorrel (Oxalis acetosella) of the family Oxalidaceae, or any of various plants of the pea family (Fabaceae), including white clover (Trifolium repens), suckling clover (T. dubium), and black medic (Medicago lupulina). According to Irish legend, St. Patrick, patron saint of Ireland, first chose the shamrock as a symbol of the Trinity of the Christian church because of its three leaflets bound by a common stalk. Wood sorrel is shipped from Ireland to other countries in great quantity for St. Patrick's Day

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Crisscross two lollipops and place one lollipop in the middle to form a
  shamrock.
When it's time to come inside after a fun day enjoying puddles and sunshine,
  make the shamrock smoothie.
Burton incorporated the rose, thistle, daffodil and shamrock into the lace.
Feature team logo application on left hip with all over knit dyed shamrock
  design.
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