retrorocket

/re-troh-rok-it/US // ˈrɛ troʊˌrɒk ɪt //UK // (ˈrɛtrəʊˌrɒkɪt) //

缩略图,缩略语,缩影,缩略词

Definitions

n.名词 noun

1
- : a small, auxiliary rocket engine, forming a part of a larger rocket vehicle and having its exhaust nozzle pointed toward the direction of flight, for decelerating the larger rocket, separating one stage from another, etc.