What is "watermill"

n. A mill (for whatever purpose) powered by water

A watermill or water mill is a mill that uses moving water as its power source. It is thus a structure that uses a water wheel or water turbine to drive a mechanical process such as milling (grinding), rolling, or hammering. Such processes are needed in the production of many material goods, including flour, lumber, paper, textiles, and many metal products. Thus watermills may be gristmills, sawmills, paper mills, textile mills, hammermills, trip hammering mills, rolling mills, wire drawing mills, and so on.

One major way to classify watermills is by wheel orientation (vertical or horizontal), one powered by a vertical waterwheel through a gearing mechanism, and the other equipped with a horizontal waterwheel without such a mechanism. The former type can be further divided, depending on where the water hits the wheel paddles, into undershot, overshot, breastshot and pitchback (backshot or reverse shot) waterwheel mills. Another way to classify water mills is by an essential trait about their location: tide mills use the movement of the tide; ship mills are water mills onboard (and constituting) a ship.

Watermill is a ballet by New York City Ballet balletmaster Jerome Robbins to Teiji Ito's eponymous music from the previous year with costumes by Patricia Zipprodt, lighting by Jennifer Tipton and décor by Robbins in association with Davie Reppa. The premiere took place on Thursday, February 3, 1972, at the New York State Theater, Lincoln Center.