noun

1. a small tower projecting from a building, usually at a corner and often merely ornamental
2. a wooden, usually square tower on wheels, carrying soldiers, battering-rams, catapults, etc., used in ancient warfare for attacking fortresses and walled cities
3. 1. a low, armored, usually revolving, structure for a gun or guns, as on a warship, tank, or fortress
   2. a transparent dome for a gun and gunner, as on a bomber
4. an attachment for a lathe, drill, etc., consisting of a block holding several cutting tools, which may be rotated to present any of the tools to the work
   also turrethead tur′ret·head′ (-hed′)
5. an adjustable device on a camera for holding various lenses

Etymology: ME turet < OFr tourete, dim. of tour: see tower