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Webster's 1828 Dictionary
SUPERSULPHATE
n.
Sulphate
with
an
excess
of
acid.
Webster's 1913 Dictionary
SUPERSULPHATE
SUPERSULPHATE
Su
`
per
*
sul
"phate, n. (
Chem.
)
Defn:
An
acid
sulphate.
[
Obs.
]