Webster’s Revised Unabridged Dictionary · 1913
Bolas
Bo′las (bō′lȧz), n. sing. & pl. [Sp.] A kind of missile weapon consisting of one, two, or more balls of stone, iron, or other material, attached to the ends of a leather cord; — used by the Gauchos of South America, and others, for hurling at and entangling an animal.