pentaprism

or pen·ta prism

[ pen-tuh-priz-uh m ]
/ ˈpɛn təˌprɪz əm /

noun

a prism that has five faces, a pair of which are at 90° to each other; a ray entering one of the pair emerges from the other at an angle of 90° to its original direction: used especially in single-lens reflex cameras to reverse images laterally and reflect them to the viewfinder.

Nearby words

  1. pentangular,
  2. pentanoic acid,
  3. pentapiperium methylsulfate,
  4. pentaploid,
  5. pentapody,
  6. pentaptych,
  7. pentaquark,
  8. pentaquine,
  9. pentarchy,
  10. pentastich

Origin of pentaprism

First recorded in 1935–40; penta- + prism

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for pentaprism

pentaprism

/ (ˈpɛntəˌprɪzəm) /

noun

a five-sided prism that deviates light from any direction through an angle of 90°, typically used in single-lens reflex cameras between lens and viewfinder to present the image the right way round
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012