The story
See thio- (“sulfur”).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Any organic compound formally derived from a carboxylic acid by replacing either or both of the carboxyl oxygen atoms with sulfur - R-C(S)OH, R-C(O)SH or R-C(S)SH Full definition →
See thio- (“sulfur”).
Etymology from Wiktionary, CC BY-SA 4.0.