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From The Collaborative International Dictionary of English v.0.48:
Nitromethane \Ni`tro*meth"ane\, n. [Nitro- + methane.] (Chem.) A nitro derivative of methane (CH3.NO2), obtained as a mobile liquid; -- called also nitrocarbol. It has been used as a rocket fuel and as a gasoline additive to add power to the fuel, especially in racing cars. [1913 Webster]