a colourless, non-flammable, toxic liquid, C2Cl4, which is widely used as a solvent, esp. in dry-cleaning fluid, and medicinally for the treatment of worm infestations, a colourless nonflammable volatile liquid, CCl2 = CCl2; r.d. 1.6; m.p. –22°C; b.p. 121°C. It is used as a solvent.