D defs.my
Entry 1 sense Webster, 1913

butyl mercaptan

· bu·tyl mer·cap·tan · IPA
01 n. A volatile liquid, C4H9.SH, having a strong odor like that of a skunk; also called butanethiol. All three isomers, normal, sec-, and tert-…
  1. 1.
    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.(Chem.) Also: butanethiol