n. [ F., fr. NL. mercurius mercury + L. captans, p. pr. of captare to seize, v. intens. fr. capere. ] (Chem.) Any one of series of compounds having an -SH radical attached to a carbon atom, also considered as hydrosulphides of alcohol radicals, in composition resembling the alcohols, but containing sulphur in place of oxygen, and hence called also the sulphur alcohols. In general, they are colorless liquids having a strong, repulsive, garlic odor. The name is specifically applied to ethyl mercaptan, C2H5SH. So called from its avidity for mercury, and other metals. [ 1913 Webster ]

n. (Chem.) A volatile liquid, C4H9.SH, having a strong odor like that of a skunk; also called butanethiol. All three isomers, normal, sec-, and tert-butanethiol possess the skunk odor. [ PJC ]

(Chem.) A gaseous substance (C2H5.SH) used as an odorant in natural gas and propane to facilitate detection and serve as a warning of leaks. [ PJC ]