silyl groups

https://doi.org/10.1351/goldbook.S05674
  1. In a strict sense, the silyl group is $\ce{H3Si\bond{–}}$.
  2. A name commonly applied to hydrocarbyl derivatives of the silyl group $\ce{R3Si\bond{–}}$.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1366 [Terms] [Paper]