Noun | 1. | perchloromethane - a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined dissolvent, dissolver, dissolving agent, resolvent, solvent - a liquid substance capable of dissolving other substances; "the solvent does not change its state in forming a solution" tetrachloride - any compound that contains four chlorine atoms per molecule |