principal point

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noun Optics.

the point where a principal plane intersects the axis.

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Origin of principal point

First recorded in 1695–1705

Words nearby principal point

principally, principal nursing officer, principal optic axis, principal parts, principal plane, principal point, principal quantum number, principal rafter, principal value, principate, Príncipe

How to use principal point in a sentence

The Hamid Karzai International Airport is the principal point of entry for foreign visitors coming to the landlocked country.
Butterfly Effect: The New Sultan of Kabul?|Charu Kasturi|June 24, 2021|Ozy
The citizens of Stevens Point defeated fluoridation by a healthy margin.
Anti-Fluoriders Are The OG Anti-Vaxxers|Michael Schulson|July 27, 2016|DAILY BEAST
Deep, situational, and emotional jokes based on what is relevant and has a POINT!
Trolls and Martyrdom: Je Ne Suis Pas Charlie|Arthur Chu|January 9, 2015|DAILY BEAST
To borrow an old right-wing talking point, these people are angry no matter what we do.
Harry Shearer on The Dangerous Business of Satire|Lloyd Grove|January 8, 2015|DAILY BEAST

Therefore, it is not possible for any F-35 schedule to include a video data link or infrared pointer at this point.
Pentagon Misfires in Stealth Jet Scandal|Dave Majumdar|January 8, 2015|DAILY BEAST
But the most important point I want to make is about what the press does now.
Ayaan Hirsi Ali: Our Duty Is to Keep Charlie Hebdo Alive|Ayaan Hirsi Ali|January 8, 2015|DAILY BEAST
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 Smoker," and "Mother and Daughter," a triptych, are two of her principal pictures.
Women in the fine arts, from the Seventh Century B.C. to the Twentieth Century A.D.|Clara Erskine Clement
It is the principal waste-product of metabolism, and constitutes about one-half of all the solids excreted—about 30 gm.
A Manual of Clinical Diagnosis|James Campbell Todd
His also was the intellectual point of view, and the intellectual interest in knowledge and its deductions.
The Mediaeval Mind (Volume II of II)|Henry Osborn Taylor
Judged from this point of view only, the elasticity provided by the new law is doubtless adequate.
Readings in Money and Banking|Chester Arthur Phillips

Medical definitions for principal point

principal point

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.