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Webster's 1913 Dictionary
SULPHACID
Sulph *
ac
"
id,
n.
Etym:
[
Sulpho-
+
acid.
] (
Chem.
)
Defn:
An
acid
in
which,
to
a
greater
or
less
extent,
sulphur
plays a
part
analogous
to
that
of
oxygen
in
an
oxyacid;
thus,
thiosulphuric
and
sulpharsenic
acids
are
sulphacids; --
called
also
sulphoacid.
See
the
Note
under
Acid,
n., 2.