hypergolic

1. not comparablefuelaeronauticsIgniting spontaneously upon contact with an oxidizer.

   1 more example

   Although the LF₂-LH₂ cryogenic combination is hypergolic, the toxicity of the fuel and the products of combustion have made the use of this system impractical. In general, the commonly used hypergolic propellants are considered conventionally storable, that is, they do not need special refrigeration equipment to keep them liquid.

   2016, Pasquale M. Sforza, Theory of Aerospace Propulsion, 2nd ed., Elsevier (Butterworth-Heinemann), page 565

2. not comparableaeronauticsInvolving 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, Stephen K. Hall, Chemical Safety in the Laboratory, CRC Press, page 65

plural hypergolics

1. countableuncountableA hypergolic propellant; a hypergol.