hypergolic /hʌɪpɚˈɡɒlɪk/adjective 2noun 1forms 1 adjective2 •Igniting spontaneously upon contact with an oxidizer. •Involving such a hypergolic agent.The chemical reaction range of hypergolic mixtures varies from slow and barely visible to an instantaneous and highly visible explosive force. — 1994 noun1 •A hypergolic propellant; a hypergol. formshypergolics