https://doi.org/10.1351/goldbook.T06348
A term including monothioacetals having the structure $\ce{R2C(OR')(SR')}$ (subclass monothioketals, $\ce{R} \neq \ce{H}$); and dithioacetals having the structure $\ce{R2C(SR')2}$ (subclass dithioketals, $\ce{R} \neq \ce{H}, \ce{R'} \neq \ce{H}$).
See also: thiohemiacetals