xylene

noun

1. (countable, uncountable)Any of a group of three isomeric aromatic hydrocarbons, found in coal and wood tar.

   “[…] proceeding, desperately, from such opiated catarrh preparations as Collis Brown's Mixture on to cocainized brain tonics, cigarettes soaked in absinthe, xylene in unventilated rooms, and so on […]”