Definition of shamrock noun from the Oxford Advanced Learner's Dictionary

 

shamrock

 noun
noun
BrE BrE//ˈʃæmrɒk//
 
; NAmE NAmE//ˈʃæmrɑːk//
 
 
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a small plant with three leaves on each stem. The shamrock is the national symbol of Ireland. Word Origin late 16th cent.: from Irish seamróg ‘trefoil’ (diminutive of seamar ‘clover’).
See the Oxford Advanced American Dictionary entry: shamrock