An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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nodal point
  نقطه‌ی ِ گرهی  
noqte-ye gerehi
Fr.: point nodal  

Any of the two points on the → axis of a → lens system, such that if the → incident ray passes through one, travelling in a given direction, the → emergent ray passes the other in a parallel direction.

See also: → nodal; → point.