Noun
a bipropellant rocket engine (rocket motor) which uses propellants that are in two different states, typically liquid and solid, which when reacted, create exhaust gases suitable for rocket propulsion.
a vehicle (rocket) propelled by a hybrid rocket engine
Source: en.wiktionary.orgHybrid rocket motor detail of SpaceShipOne A hybrid rocket is a rocket with a rocket motor which uses rocket propellants in two different phases. Source: Internet
Hybrid rocket motors can be transported to the launch site with the oxidizer and fuel stored separately, improving safety. Source: Internet