投石機

とうせきき

noun

catapult, ballista, mangonel, onager, trebuchet

sling, slingshot(only relevant for 投石器)

投	throw, discard, abandon, launch into, join, invest in, hurl, give up, sell at a loss
石	stone
機	loom, mechanism, machine, airplane, opportunity, potency, efficacy, occasion
器	utensil, vessel, receptacle, implement, instrument, ability, container, tool, set