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.
Words nearby pentaprism
pentangular,
pentanoic acid,
pentapiperium methylsulfate,
pentaploid,
pentapody,
pentaprism,
pentaptych,
pentaquark,
pentaquine,
pentarchy,
pentastich
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