Hybrid Rocket Motor 1 : A rocket motor in which the fuel exists in a different physical state (solid, liquid, or gaseous) than the oxidizer and that derives its force or thrust from the combination thereof
NFPA 1125 Code for the Manufacture of Model Rocket and High Power Rocket Motors, 2001 ed. (Code: Mfg of Model Rocket and High Pwr Rocket Motors - Amer) {379 NFC}