-thioic acid

-thioic ac·id

Suffix denoting the radical, -C(S)OH or -C(O)SH, the sulfur analog of a carboxylic acid, that is, a thiocarboxylic acid.

-thioic ac·id

(as'id)
Suffix denoting the radical -C(S)OH or -C(O)SH, the sulfur analogue of a carboxylic acid.