Noun
Any
of
a
class
of
organic
compounds
of
sulphur
, (
R
<
sub
>
1
sub
>.
S
.
R
<
sub
>
2
sub
> );
they
tend
to
be
foul-smelling
.
When
R
<
sub
>
2
sub
>
is
a
hydrogen
atom
,
they
are
termed
thiols
or
thioalcohols
.