What does the word shibboleth mean?

Usage examples for shibboleth

  1. The events occurred in 1600, but the interest which they excited was so keen that belief in the guilt or innocence of the two noble brothers who perished in an August afternoon, was a party shibboleth in the Wars of the Saints against the Malignants, the strife of Cavaliers and Roundheads. – James VI and the Gowrie Mystery by Andrew Lang