n. n. An attachment to a lathe, drill, boring-machine, or slotting-machine designed to hold and present to the work a series of boring-, drilling-, or cutting-tools, the object being to save the time lost in changing from one tool to another by hand.n. A little tower rising from or otherwise connected with a larger building; a small tower, often crowning or finishing the angle of a wall, etc.n. In medieval warfare, a movable building of a square form, consisting of ten or even twenty stories, and sometimes 180 feet high, usually moved on wheels, and employed in approaches to a fortified place for carrying soldiers, engines, ladders, etc.n. Milit., a tower, often revolving, for offensive purposes, on land or water. See cut under monitor.n. In her.: A small slender tower, usually forming part of a bearing, being set upon a larger tower. Sec turreted, 3.n. A bearing representing a kind of scepter having both ends alike and resembling the ends of the cross avellane. See tirret.n. In a railroad-car of American model, the raised part of the middle of the roof, utilized for affording light and ventilation.n. In a lathe, a cylindrical or polygonal block on the bed, with holes around it for dies.n. Same as terret.