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Webster 1913 Edition

Noun.

[L.

acus

needle + E.

node

(Geom.)

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.

acnode ‎(plural acnodes)

(geometry) An isolated point not upon a curve, but whose coordinates satisfy the equation of the curve so that it is considered as belonging to the curve.