Thio- is a prefix that means, replace oxygen with sulphur. For example, a sulphate ion is SO42-; a thiosulphate ion is S2O32-. A cyanate ion is OCN-; a thiocyanate ion is SCN-.
Citing this page:
Generalic, Eni. "Thio." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.