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.
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.