IPA: //ˌθaɪoʊˈsʌlfeɪt//
KK: /θaɪoʊˈsʌlfeɪt/
A chemical compound that is a salt or ester derived from thiosulfuric acid, often containing the anion SO.
Thiosulfate is commonly used in photography and as a reducing agent in chemical reactions.
Thiosulfate is formed from "thio-" (from Greek "thio", meaning sulfur) and "sulfate" (from Latin "sulfatum", meaning salt of sulfur). The word refers to a compound containing sulfur and a sulfate group.
Think of 'thio' meaning sulfur, and 'sulfate' referring to a salt of sulfur — together they describe a compound that includes sulfur in its structure.
No commonly confused words.