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Webster's 1913 Dictionary
ACNODE
Ac
"
node,
n.
Etym:
[L.
acus
needle
+ E.
node.
] (Geom.)
Defn:
An
isolated
point
not
upon
a
curve,
but
whose
coördinates
satisfy
the
equation
of
the
curve
so
that
it
is
considered
as
belonging
to
the
curve.