https://doi.org/10.1351/goldbook.T06357
Compounds having the structure $\ce{R2C=S=O}$ ($\ce{R} \neq \ce{H}$). (Also known by the disapproved term 'sulfines' which comprises thioaldehyde S-oxides and thioketone S-oxides.)
See also: thioaldehyde S-oxides