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1. Oxford American Dictionary

   pentaprism

   • IPA[ˈpen(t)əˌpriz(ə)m]

   美式

   • n.
     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.

   • noun: pentaprism, plural noun: pentaprisms

2. • 更多解釋

   pentaprism

   • IPA[ˈpɛntəprɪz(ə)m]

   英式

   • n.
     a prism having a five-sided cross section with two silvered surfaces, giving a constant ...

   Oxford Dictionary