-thio·ic
\|thī|ōik\  adjective combining form 
Etymology: International Scientific Vocabulary thi- + -ic 
 : containing one atom of sulfur replacing one oxygen atom in the molecule of an acid 
< phosphorothioic acid >
< octanethioic acid C7H15COSH >
< phosphorothioic acid >
< octanethioic acid C7H15COSH >