IPA: /θaɪˈɒnɪk/
KK: /θaɪˈɒnɪk/
Relating to or containing sulfur, a chemical element often found in various compounds.
The thionic compounds are essential in many industrial processes.
Thionic is derived from "thio-" (from Greek "thio", meaning sulfur) and "-nic" (a suffix used in chemistry to denote a relationship or pertaining to). The word "thionic" refers to compounds that contain sulfur, indicating a relationship to sulfur in their chemical structure.
Think of 'thio-' which relates to sulfur, and remember that 'thionic' means something that pertains to or contains sulfur.