Laufradl

Etymology
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Noun

 * 1) balance bicycle
 * 2) treadwheel, treadmill
 * 3) impeller a rotating component that accelerates fluid outward from a center of rotation, found in devices such as pumps, water jets, washing machines, and agitated tanks.
 * 1) impeller a rotating component that accelerates fluid outward from a center of rotation, found in devices such as pumps, water jets, washing machines, and agitated tanks.