Definition of shamrock
: a trifoliolate plant used as a floral emblem by the Irish: such as
a
: a yellow-flowered Old World clover (Trifolium dubium) often regarded as the true shamrock
b
: wood sorrel
c
: white clover
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Merriam-Webster unabridged
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Time Traveler for shamrock
The first known use of shamrock was in 1577
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