(physics, engineering) A tower, containing a long evacuated tube, within which objects can be dropped experimentally. / An amusement ride in which riders experience free fall.

A fortification in the form of a cylindrical tower, typically resembling a drum. / A tower in the center of a premodern Chinese city that houses signal drums.

(gaming) A structure, containing deflecting objects called bafflers and having a tray at the bottom, into which dice are dropped to produce a fair roll in limited space.

A tower built into and forming part of a line of fortification or a fortified city wall.

(historical) A high tower fitted with arclights, formerly common in 19th-century cities with electricity, as a means of illuminating public spaces.

A small urban area next to the Tower of London, borough of Tower Hamlets, Greater London (OS grid ref TQ3380). / A village in Chipperfield parish, Dacorum borough, Hertfordshire (OS grid ref TL0302).

movable tower used in sieges

Synonym of moonlight tower

(Hong Kong) A building specifically built for enclosing lifts (elevators), sometimes including stairs.

(figuratively) A visionary and impractical plan. / Alternative spelling of tower of Babel