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Webster's 1913 Dictionary
SESQUISULPHIDE
Ses
`
qui
*
sul
"phide, n.
Etym:
[
Sesqui-
+
sulphide.
] (
Chem.
)
Defn: A
sulphide,
analogous
to
a
sesquioxide,
containing
three
atoms
of
sulphur
to
two
of
the
other
ingredient;
--
formerly
called
also
sesquisulphuret;
as,
orpiment,
As2S3
is
arsenic
sesquisulphide.