from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to a rocket propellant consisting of fuel and an oxidizer that ignite spontaneously on contact.
- adj. Using such a fuel.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of fuel or propellant, igniting spontaneously on contact with an oxidiser.
From German Hypergol, a hypergolic fluid propellant : from hyper-, extreme (from Greek huper-; see hyper-) + Greek ergon, work; see erg.(American Heritage® Dictionary of the English Language, Fourth Edition)
German, probably from Greek υπέρ + έργον ("work"). (Wiktionary)