sulfenyl groups

synonym: sulfanyl groups
https://doi.org/10.1351/goldbook.S06098
Groups having the structure $\ce{RS–}$ ($\ce{R} \neq \ce{H}$). This term is derived from sulfenic acids. The synonymous term sulfanyl groups is derived from sulfane, $\ce{H2S}$. E.g. $\ce{CH3–S–}$ methanesulfenyl, methylthio or methylsulfanyl.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1368 [Terms] [Paper]