Wan'kel en'gine

an internal-combustion rotary engine that utilizes a triangular rotor that revolves in a chamber (rather than a conventional piston that moves up and down in a cylinder): it has fewer moving parts and is generally smaller and lighter for a given horsepower. Also called Wan'kel.

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

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