What does the Irish word 'seamróg' mean?

The Irish word “seamróg” means “young clover.”

The word is a diminutive form of the Irish noun “seamair,” meaning clover. In English, “seamróg” became “shamrock,” the name now used for the small three-leaved plant regarded as a national symbol of Ireland. The word describes the plant itself, not the ideas of luck or Irishness later attached to it.

The shamrock’s famous connection with Saint Patrick comes from tradition. Patrick is said to have used its three leaflets to explain the Christian doctrine of the Trinity: the Father, Son and Holy Spirit as three persons in one God. The story is a later legend rather than something recorded in Patrick’s surviving writings.

Another common mix-up is treating the shamrock as one precisely defined botanical species. Lesser clover and white clover are often identified with the Irish shamrock, but several three-leaved plants have been called shamrocks. A four-leaf clover is also different: it is a rare variation and is associated with good luck, whereas “young clover” is the literal meaning of the Irish word.