What does "epitrochoidal engine" mean?

a rotary engine that is a four-stroke internal-combustion engine without reciprocating parts

What is a synonym for "epitrochoidal engine"?

Common synonyms include: wankel, wankel engine, wankel rotary engine.

Rare ·Advanced level

Noun

1
a rotary engine that is a four-stroke internal-combustion engine without reciprocating parts wordnet