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Webster's 1913 Dictionary
PROTOSULPHIDE
Pro
`
to
*
sul
"phide, n.
Etym:
[
Proto-
+
sulphide.
] (
Chem.
)
Defn:
That
one
of
a
series
of
sulphides
of
any
element
which
has
the
lowest
proportion
of
sulphur;
a
sulphide
with
but
one
atom
of
sulphur
in
the
molecule.
The Wordsmith Dictionary
The Wordsmith Dictionary