noun
Technical term in mechanical engineering; refers to an engine that converts pressure into rotating motion using pistons.
往復機関は、ピストンの往復運動を回転運動に変える。
A reciprocating engine converts the reciprocating motion of pistons into rotational motion.
Synonymous loanword from English 'reciprocating engine'; commonly used in automotive and aviation contexts.
Compound of 往復 (round trip, reciprocation) and 機関 (engine, mechanism).