Definition of pentaprism in English:

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pentaprism

Pronunciation: /ˈpen(t)əˌprizəm/

noun

A five-sided prism with two silvered surfaces giving a constant deviation of all rays of light through 90°, used chiefly in the viewfinders of single-lens reflex cameras.
Example sentences
  • DSLR (Digital Single Lens Reflex) by definition have optical viewfinders, usually consisting of a instant-return mirror and a pentaprism.
  • I was just looking through my junk bin over the weekend and I found that I have a number of pentaprisms taken out of 35mm SLR cameras.
  • Pros, from what I've read, is that mirror pentaprisms are lighter, can be made smaller to save space, and are cheaper to manufacture than glass pentaprisms.

For editors and proofreaders

Syllabification: pen·ta·prism

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