What is a steel cutting instrument, with a long bent shank set in a handle which rests against the shoulder of the operator. It is operated by a thrust movement, and used in paring the hoofs of horses called?

butteris — A steel cutting instrument, with a long bent shank set in a handle which rests against the shoulder of the operator. It is operated by a thrust movement, and used in paring the hoofs of horses. (Webster's 1913.)