Porro prism

[ pawr-oh ]

/ ˈpɔr oʊ /

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noun Optics.

an isosceles, right-triangular prism in which light entering one half of the hypotenuse face is reflected at the two short sides and is reversed in orientation when it leaves the other half of the hypotenuse: used in 90°-oriented pairs in binoculars to increase the length of the optical path and to erect the final image.

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Origin of Porro prism

Named after Ignazio Porro (1801–75), Italian engineer

Words nearby Porro prism

porpoise, porrect, porridge, porrigo, porringer, Porro prism, Porsena, Porson, port, porta, portabella

How to use Porro prism in a sentence

I recognize my inability to truly understand these events in the same context or view these events through exactly the same prism.
Dr. Howard Fuller's Injustice Education|Campbell Brown|December 21, 2014|DAILY BEAST
You had the PRISM program, and you also have National Security letters.
Laura Poitras on Snowden's Unrevealed Secrets|Marlow Stern|December 1, 2014|DAILY BEAST
He pops from the screen as a charismatic, occasionally messianic “human prism,” as Moss calls him.
The Pastor Who Scandalized His Town|Lloyd Grove|October 8, 2014|DAILY BEAST
Snowden himself exposed a program known as PRISM that provided these so-called back doors to the NSA in the United States.
Sorry, Snowden: Putin Lied to You About His Surveillance State—And Made You a Pawn of It|Eli Lake|April 18, 2014|DAILY BEAST

Mistakes happen, nuance is often lost, and everything is seen through a prism of who is winning and who is losing.
When Campaign Spin Becomes Fact|Stuart Stevens|March 21, 2014|DAILY BEAST
Becoming the preceptor of two young sons of Count Porro, I was to them as a father, and their father acted like a brother to me.
My Ten Years' Imprisonment|Silvio Pellico
The sons of Count Porro are more than once alluded to by their friend and tutor, as the author designates himself.
My Ten Years' Imprisonment|Silvio Pellico
At eighteen does not love hold a prism between the world and the eyes of a young girl?
At the Sign of the Cat and Racket|Honore de Balzac
His name and his bright past, seen through the prism of whispered gossip, had gained him the nickname of The Admiral.
Tales and Fantasies|Robert Louis Stevenson
It was an irregular trapezium, a mass struck off from the colossal granitic prism of the Great Douvre.
Toilers of the Sea|Victor Hugo