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nodal point

noun, Optics.
either of two points on the axis of a lens or other optical system, determined by extending an incident oblique ray and the corresponding refracted ray to the axis for the pair of rays that are parallel outside the optical system.
Also called node.
Origin of nodal point
First recorded in 1835-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for nodal point
Historical Examples
  • All the roads of his speculation start from that nodal point in the story of man.

    Hilaire Belloc C. Creighton Mandell
  • He was their nodal point, their focus, their expression in a single term.

    Jude the Obscure

    Thomas Hardy
  • Every point which he marks is the nodal point for numberless relations.

    The Photoplay Hugo Mnsterberg
  • It was to break the Hindenburg lines at their nodal point in front of Cambrai.

nodal point in Medicine

nodal point n.
One of the two points in a compound optical system, located so that a light ray directed through the first point will leave the system through the second point, parallel to its original direction. Also called axial point.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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