Wiktionary
liquid rocket
n. 1 A rocket that uses liquid propellants 2 A rocket engine that uses liquid propellants
Usage examples of "liquid rocket".
The five liquid rocket engines of the Saturn VB booster's first stage, the MS-IC, had ignited a full eight seconds ahead of the enhanced Saturn's four Solid Rocket Boosters.
Just as it hit the ground, the single-stage liquid rocket propellant ignited.
The cruisers, powered by nuclear converters, did not use the liquid rocket fuel but nuclear converters were far too large and complex to permit their installation in the EDS.
Staging: the four strap-on liquid rocket boosters had been discarded.