Lithic \Lith"ic\, a. [Gr. ? of or belonging to stones, fr. li`qos stone: cf. F. lithique.] 1. Of or pertaining to stone; as, lithic architecture. 2. (Med.) Pertaining to the formation of uric-acid concretions (stone) in the bladder and other parts of the body; as, lithic diathesis. {LIthic acid} (Old Med. Chem.), uric acid. See {Uric acid}, under {Uric}.