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principal point

noun, Optics.
1.
the point where a principal plane intersects the axis.
Origin of principal point
1695-1705
1695-1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for principal point
Historical Examples
  • This is the first and principal point at which we can stanch the wastage of teaching energy that now goes on.

    The Salvaging Of Civilisation H. G. (Herbert George) Wells
  • The mansion therefore was his principal point of view from this situation.

    Imogen William Godwin
  • There was at first, but the principal point is that she has decided she can't be happy with me.

    Destiny Charles Neville Buck
  • The right of indemnity does not, however, constitute the principal point.

    The Sexual Question August Forel
  • The principal point is to enumerate the characters found to be clearly distinct from each other.

  • Well, then, my friends, this principal point at least is decided.

    The Bravo of Venice Heinrich Zschokke
  • The principal point is the great convent of Santa Clara, which has been converted into a hospital.

  • The principal point of interest, about it is the ruins of an old temple.

    The Prehistoric World E. A. Allen
  • But it is certain that this is the principal point with regard to the acquisition of eternal life.

  • And the principal point is that I need not have gone, but that I offered myself.

    Sevastopol Lyof N. Tolsto
principal point in Medicine

principal point n.
One of the two points in an optical system where the axis is cut by the two principal planes. Lines drawn from these to corresponding points on the object and the image will be parallel.

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