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Definition of Thia-
1. Prefix. Used to form the names of chemical compounds containing sulfur, especially such compound in which a sulfur atom replaces an oxygen atom in an analogous compound ¹
¹ Source: wiktionary.com
Medical Definition of Thia-
1. The replacement of carbon by sulfur in a ring or chain. Compare: thio-. Origin: G. Theion (05 Mar 2000)