Bull-roarer (Fr.: planchette ronflante, rhombe; Ger.: Schwirrholz; It.: rombo sonore; Sp.: palo zumbador), aerophone consisting of a rhomboid piece of wood, frequently carved, attached to a string passed through a small hole pierced at one end, and whirled through the air. The string is held in the player's hand or is attached to a stick, thereby forming a whip. The smaller the piece of wood, the faster it whirls and the higher the pitch of the sound it produces. While being whirled it turns on…