turret
tur.ret \'t*r-*t, 't*-r*t, 'tu.r-*t\ n [ME touret, fr. MF torete, tourete, fr. OF, dim. of tor], tur tower - more at TOWER 1: a little tower; specif : an ornamental structure at an angle of a larger structure 2a: a pivoted and revolvable holder in a machine tool 2b: a monitor on a fire truck or on the deck of a fireboat 2c: a photographic or television camera device holding several lenses 3a: a tall building usu. moved on wheels and formerly used for carrying sol diers and equipment for breaching or scaling a wall 3b1: a gunner's fixed or movable enclosure in an airplane 3b2: a revolving structure on a warship protecting the breech portion of a gun 3b3: the upper structure of a tank rotatable for swinging the gun mounted w ithin it
Webster's English Dictionary