“ DOG-TOOTH (the French dent-de-scie) , in architecture, an ornament found in the mouldings of medieval work of the commencement of the 12th century, which is thought to have been introduced by the Crusaders from the East. The earliest example is found in the hall at Rabbath-Ammon in Moab (c. A.D. 614) built by the Sassanians, where it decorates the arch moulding of the blind arcades and the string courses. In the apse of the church at Murano, near Venice, it is similarly employed. ”