What is "dinitrogen tetroxide"

n. (context inorganic compound English) A binary compound of nitrogen and oxygen, N₂O₄, that exists in equilibrium with nitrogen dioxide NO₂; it is a powerful oxidizing agent and is used in rocket propellants.

Dinitrogen tetroxide, commonly referred to as nitrogen tetroxide, is the chemical compound NO. It is a useful reagent in chemical synthesis. It forms an equilibrium mixture with nitrogen dioxide.

Dinitrogen tetroxide is a powerful oxidizer that is hypergolic (spontaneously reacts) upon contact with various forms of hydrazine, which makes the pair a popular bipropellant for rockets.