1) Aztec spear-thrower 2) Spear-throwing tool 
A wood or bone shaft implement, held in one hand, and used to propel a spear. The tool functions as a lever, giving greater thrust and distance.
The Aztec word for a spear throwing stick device. This projectile propulsion device preceded the bow and arrow. In general, a wooden or bone stick or board with a hand grip at one end and a spur or hook at the other end. The atlatl is used as an extension of the arm in throwing a spear or dart. The spear shaft is socketed and fits into the spur or ......spearthrower; a stick with a hook on the end (that often looks like a large crochet hook) used to throw a spear or dart 2 and ½ times further
spear-thrower (def. 2).