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Webster's 1913 Dictionary
THIOSULPHURIC
Thi
`o *
sul
*phur "
ic,
a.
Etym:
[
Thio-
+
sulphuric.
] (
Chem.
)
Defn:
Of,
pertaining
to,
or
designating,
an
unstable
acid,
H2S2O3,
analogous
to
sulphuric
acid,
and
formerly
called
hyposulphurous
acid.