Definition of hypergolic in English:

hypergolic

Syllabification: hy·per·gol·ic
Pronunciation: /ˌhīpərˈgälik
 
/

adjective

  • (Of a rocket propellant) igniting spontaneously on mixing with another substance.
    More example sentences
    • The Titan uses Aerojet-General LR87 and LR91 engines burning liquid hypergolic propellants that ignite spontaneously on contact.
    • Other onboard power sources serve as latent explosion triggers, including batteries, other pressurized systems, fuel cells and hypergolic fuels.
    • The testing of the hypergolic performance of the formulations can be achieved without gelling.

Origin

1940s: from German Hypergol, probably from hyper- 'beyond' + Greek ergon 'work' + -ol.

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used to address an English nobleman