shamrock
/ˈʃæmrɒk/noun
1- a low-growing clover-like plant with three-lobed leaves, used as the national emblem of Ireland白花酢浆草（爱尔兰国花）, 三叶草。
1.1
- The shamrock of legend has been identified with a number of different plants in the family Leguminosae, in particular the lesser yellow trefoil (Trifolium minus).传说中的三叶草指好几种豆科植物, 尤指钝叶车轴草。
1.2
- a spray or leaf of this plant三叶草枝（或叶）。
词源
late 16th cent.: from Irish seamróg 'trefoil' （diminutive of seamar 'clover'）.