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Webster's 1913 Dictionary
HYPONITROUS
Hy
`
po
*
ni
"trous, a.
Etym:
[
Pref.
hypo-
+
nitrous.
] (
Chem.
)
Defn:
Containing
or
derived
from
nitrogen
having
a
lower
valence
than
in
nitrous
compounds.
Hyponitrous
acid
(
Chem.
),
an
unstable
nitrogen
acid,
NOH,
whose
salts
are
produced
by
reduction
of
the
nitrates,
although
the
acid
itself
is
not
isolated
in
the
free
state
except
as
a
solution
in
water;
--
called
also
nitrosylic
acid.
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