Hypergolic definition

hīpər-gŏlĭk

Of or relating to a rocket propellant consisting of fuel and an oxidizer that ignite spontaneously on contact.

adjective

Using such a fuel.

adjective

Igniting spontaneously when mixed together, as rocket fuel and oxidizer combinations.

adjective

Relating to or using a rocket propellant consisting of liquid fuel and an oxidizer that ignite spontaneously on contact.

Of fuel or propellant, igniting spontaneously on contact with an oxidiser.

adjective

Origin of hypergolic

From German Hypergol a hypergolic fluid propellant from hyper- extreme (from Greek huper- hyper–) Greek ergon work erg¹

From American Heritage Dictionary of the English Language, 5th Edition
From German, from Ancient Greek υπέρ (ypér) + έργον (érgon, “work”).

From Wiktionary