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wheel' and ax'le

a simple machine consisting, in its typical form, of a cylindrical drum to which a wheel concentric with the drum is firmly fastened: ropes are so applied that as one unwinds from the wheel, another rope is wound on to the drum.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

wheelwheel animalcule
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