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2017 Word of the Year

principal point

noun, Optics.
1.
the point where a principal plane intersects the axis.
Origin of principal point
1695-1705
First recorded in 1695-1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for principal point
Historical Examples
  • The mansion therefore was his principal point of view from this situation.

    Imogen William Godwin
  • The right of indemnity does not, however, constitute the principal point.

    The Sexual Question August Forel
  • Well, then, my friends, this principal point at least is decided.

    The Bravo of Venice Heinrich Zschokke
  • But, as so often happens, the cracker in the tail is here the principal point.

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

    The Prehistoric World E. A. Allen
  • The Hellespont itself was, of course, one principal point of danger.

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

    Sevastopol Lyof N. Tolsto
  • The principal point is to find out if all at the hacienda have been killed.

  • The principal point, however, was to know what road they had taken.

  • The principal point to be considered in selecting a razor is the quality of the steel.

    Shaving Made Easy Anonymous
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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