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Water wheel

Definition: Any wheel for propelling machinery or for other
purposes, that is made to rotate by the direct action of water; --
called an overshot wheel when the water is applied at the top, an
undershot wheel when at the bottom, a breast wheel when at an
intermediate point; other forms are called reaction wheel, vortex
wheel, turbine wheel, etc.

Water wheel

Definition: The paddle wheel of a steam vessel.

Water wheel

Definition: A wheel for raising water; a noria, or the like.