sham.rock HFAm7rBk, $-rB:k n a plant which has three round leaves, arranged in a triangular pattern, on each stem 三叶苜蓿，白花酢浆草 The shamrock is the national emblem of Ireland. [U] 三叶苜蓿是爱尔兰的国徽。 A clump of shamrocks was growing in the lawn. [C] 草地上长着一丛三叶苜蓿。