shamrock

Từ điển Oxford Advanced Learner 8th

sham·rock [shamrock shamrocks] BrE [ˈʃæmrɒk] NAmE [ˈʃæmrɑːk] noun
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’).

• Từ đồng nghĩa / Synonyms:
  hop clover, lesser yellow trefoil, Trifolium dubium, common wood sorrel, cuckoo bread, Oxalis acetosella, white clover, dutch clover, Trifolium repens