Pronunciation: (spēr'thrō"ur),[key] —n.Anthropol. 1. a flexible device for launching a spear, usually a short cord wound around the spear so that when thrown the weapon will rotate in the air.
2. Also called atlatl. a rigid device for increasing the speed and distance of a spear when thrown, usually a flat wooden stick with a handhold and a peg or socket to accommodate the butt end of the spear.