IPA: //ˈθaɪənaɪl//
KK: /θaɪəˈnɪl/
A chemical compound containing sulfur and oxygen, often used in various chemical reactions and processes.
Thionyl chloride is commonly used in organic synthesis.
Thionyl is derived from "thio-" (from Greek "thio", meaning sulfur) and "-yl" (a suffix used in chemistry to denote a radical or a group derived from a compound). The word refers to a chemical group containing sulfur, specifically in the context of thionyl chloride, which is a compound containing sulfur and oxygen.
Think of 'thio' as relating to sulfur, and remember that 'thionyl' refers to a chemical group that includes sulfur.