Porro prism

noun

A reflection prism used in optical instruments to alter the orientation of an image. It consists of a block of glass shaped as a right geometric prism with right-angled triangular end faces.

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Meanings

nounPorro prism (plural Porro prisms)

plural Porro prisms

  1. A reflection prism used in optical instruments to alter the orientation of an image. It consists of a block of glass shaped as a right geometric prism with right-angled triangular end faces.

Origin

Named after its inventor, Ignazio Porro.

Full word history & related roots →
Cite this entry
APA

Porro prism. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Porro%20prism

MLA

“Porro prism.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Porro%20prism. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Porro prism,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Porro%20prism.

Source: Porro prism on Wiktionary, CC BY-SA 4.0.