Sentence:  The bearer usually also holds a <WSD>spearthrower</WSD> (atlatl), fashioned as an arm-length wand that has circular white (shell) finger holds and a hooked end to launch the spears; these <WSD>spearthrowers</WSD> may be embellished with eagle feathers and down balls (Fig. 19ac). 
Meaning of the word marked with <WSD> tags:  A hand-held tool used as a lever to increase the throwing distance and penetrating force of a spear or dart, an atlatl; a woomera.