thiol

thi·ol

noun \ˈthī-ˌȯl, -ˌōl\

Definition of THIOL

1

: any of a class of compounds that are analogous to alcohols and phenols but contain sulfur in place of oxygen with the general formula RSH and in the case of those of low molecular weight have very disagreeable odors—called also mercaptan

2

: the functional group −SH characteristic of thiols

—thi·o·lic \thī-ˈō-lik\ adjective