Pentamirror

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A system of three (not five) mirrors used as a cheaper substitute to a pentaprism in the viewfinders of some single-lens reflex cameras

Etymology

From penta- + mirror.

Related phrases

single lens reflex

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.