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.
a small auxiliary rocket engine on a larger rocket, missile, or spacecraft, that produces thrust in the opposite direction to the direction of flight in order to decelerate the vehicle or make it move backwards Often shortened to retro
adjective 1. turned backward. adjective 1. (esp of plant parts) pointing backwards or in a direction opposite to normal
[re-troh-ser-it, -eyt] /ˌrɛ troʊˈsɛr ɪt, -eɪt/ adjective, Botany, Zoology. 1. having retrorse teeth or barbs.
[re-troh-ser-yuh-lit, -leyt, -ser-uh-] /ˌrɛ troʊˈsɛr yə lɪt, -ˌleɪt, -ˈsɛr ə-/ adjective, Botany, Zoology. 1. having tiny retrorse teeth or barbs.
noun 1. a heterosexual man who spends little time and money on his personal appearance adjective 2. of or relating to such men