(1):

(n.) The central part, usually cylindrical, of a wheel; the nave. See Illust. of Axle box.

(2):

(n.) A goal or mark at which quoits, etc., are cast.

(3):

(n.) The hilt of a weapon.

(4):

(n.) A block for scotching a wheel.

(5):

(n.) A hardened, engraved steel punch for impressing a device upon a die, used in coining, etc.

(6):

(n.) A rough protuberance or projecting obstruction; as, a hub in the road. [U.S.] See Hubby.

(7):

(n.) A screw hob. See Hob, 3.