资料来源 : pyDict

极点; 孤点; 孤立点

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Acnode \Ac"node\, n. [L. acus needle + E. node.] (Geom.)
   An isolated point not upon a curve, but whose co["o]rdinates
   satisfy the equation of the curve so that it is considered as
   belonging to the curve.