(n) a life preserver consisting of a connected pair of inflatable bags that fit under a person's arms and provide buoyancy; used by children learning to swim
1. 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. [ 1913 Webster ]
2. The paddle wheel of a steam vessel. [ 1913 Webster ]
3. A wheel for raising water; a noria, or the like. [ 1913 Webster ]
(Arch.) One of two walls built on either side of the junction of a bridge with the bank of a river, to protect the abutment of the bridge and the bank from the action of the current. [ 1913 Webster ]
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