Real Dictionary

Wankel engine in American English
a rotary internal-combustion engine having a three-lobed rotor and requiring fewer parts than a comparable piston-operated engine: it is less efficient and less powerful than reciprocating engines
noun: 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 horsepowe

Wankel engine in British English
noun: a type of four-stroke internal-combustion engine without reciprocating parts. It consists of one or more approximately elliptical combustion chambers within which a curved triangular-shaped piston rotates, by the explosion of compressed gas, dividing the