It is the name of a very flammable and volatile petroleum-derived product, which is used as solvent for water insoluble substances and paint thinning.
Type of organic solvent for oil paints. Your fumes are toxic. It is the spanishing of the English thinner ( "slimming, solvent" ).
Slimming, diluting, you'll hold some synonyms, words or similar expressions can be thiner, thinner