In a strict sense, hydroxy derivatives of silanes SinH2n+1OH.
A name commonly applied to Si-hydrocarbyl derivatives, R3SiOH, of silanol, H3SiOH.
Source: PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1365 (https://doi.org/10.1351/pac199567081307)