Ligroin \Lig"ro*in\ (l[i^]g"r[-o]*[i^]n), n.
A trade name applied somewhat indefinitely to some of the
volatile products obtained in refining crude petroleum. It is
a complex and variable mixture of several hydrocarbons,
generally boils below 170[deg] Fahr., and is more inflammable
than safe kerosene. It is used as a solvent, as a carburetant
for air gas, and for illumination in special lamps.
[1913 Webster]