lithic /ˈlɪθɪk/adjective 5noun 3forms 3 adjective5 •Relating to stone. •Relating to rock. •pertaining to Native American culture before circa 8,500 BCE. •Relating to lithium. •Relating to the formation of uric acid concretions (stones) in the bladder and other parts of the body. noun3 •A stone tool or projectile. •A lithic fragment: a piece of another rock eroded down to sand size. •A medicine that prevents stone in the bladder. formslithics · more lithic · most lithic