noun
Technical term for a piston engine that converts pressure into rotating motion; used in automotive, aviation, and engineering contexts.
この飛行機はレシプロエンジンを搭載している。
This aircraft is equipped with a reciprocating engine.
A rotary engine uses a rotating triangular rotor instead of reciprocating pistons.
Loanword from English 'reciprocating engine', adapted into katakana.