Definitions for "Retrorocket"
a small rocket engine on a larger rocket or spacecraft that is fired to slow or alter its course
a rocket A rocket is a vehicle, missile or aircraft which obtains thrust by the reaction to the ejection of fast moving exhaust from within a rocket engine
A rocket so mounted on a vehicle or spacecraft that it fires in the direction opposite to the motion of the vehicle or spacecraft. Retrorockets are used to slow down the vehicles on which they are mounted.