1. The central part, usually cylindrical, of a wheel; the nave. See Illust. of Axle box. 2. The hilt of a weapon. Halliwell. 3. A rough protuberance or projecting obstruction; as, a hub in the road. [U.S.] See Hubby. 4. A goal or mark at which quoits, etc., are cast. 5. (Diesinking) A hardened, engraved steel punch for impressing a device upon a die...