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Webster's 1913 Dictionary
TRITHIONIC
Tri
`
thi
*
on
"
ic,
a.
Etym:
[
Pref.
tri-
+
thionic.
] (
Chem.
)
Defn:
Of
or
pertaining
to,
or
designating,
a
certain
thionic
acid,
H2S3O6
which
is
obtained
as
a
colorless,
odorless
liquid.