thialol

from The Century Dictionary.

• noun A colorless oil, (C₂H₅)₂S₂, prepared by the distillation of a mixture of potassium ethyl sulphate, potassium disulphid, and water. It boils at 152.8–153.4° C. under 730 millimeters pressure and has an odor of garlic. Also called diethyl sulphid.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A colorless oily liquid, (C2H5)2S2, having a strong garlic odor; -- called also ethyl disulphide. By extension, any one of the series of related compounds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete, organic chemistry diethyldisulfide (C2H5)2S2