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Webster's 1913 Dictionary
METHIONIC
Meth
`i *
on
"
ic,
a.
Etym:
[
Methyl
+
thionic.
] (
Chem.
)
Defn:
Of,
pertaining
to,
or
designating,
a
sulphonic
(
thionic
)
acid
derivative
of
methane,
obtained
as
a
stable
white
crystalline
substance,
CH2.(SO3H )2,
which
forms
well
defined
salts.
The Wordsmith Dictionary
The Wordsmith Dictionary