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New American Oxford Dictionary

hypergolic

hy per gol ic |ˌhīpərˈgälik ˌhaɪpərˈɡɑlɪk | ▶adjective (of a rocket propellant ) igniting spontaneously on mixing with another substance. ORIGIN 1940s: from German Hypergol, probably from hyper- ‘beyond ’ + Greek ergon ‘work ’ + -ol .

 

Oxford Dictionary

hypergolic

hypergolic |ˌhʌɪpəˈgɒlɪk | ▶adjective (of a rocket propellant ) igniting spontaneously on mixing with another substance. ORIGIN 1940s: from German Hypergol, probably from hyper- ‘beyond ’ + Greek ergon ‘work ’ + -ol .