thiol

In organic chemistry, a thiol is a compound that contains the functional group composed of a sulfur atom and a hydrogen atom (-SH). Being the sulfur analogue of an alcohol group (-OH), this functional group is referred to either as a thiol group or a sulfhydryl group. More traditionally, thiols are often referred to as mercaptans.
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Thiol /thi·ol/ 1. sulfhydryl. 2. any organic compound containing the —SH group. thi·ol n. 1. See mercaptan. 2. [more]Thiol - Community and Resources

n. mercaptan, any of a class of foul-smelling chemical compounds which contain sulfur (Chemistry)