1. Mil. Antiq. A movable tower erected by besiegers for purposes of attack and defense.
2. A bell tower, usually attached to a church or other building, but sometimes separate; a campanile.
3. A room in a tower in which a bell is or may be hung; or a cupola or turret for the same purpose.
4. Naut. The framing on which a bell is suspended.
n 1: a bell tower; usually stands alone unattached to a building
2: a room (often at the top of a tower) where bells are hung