pentaprism Syllabification: (pen·ta·prism)Pronunciation: /ˈpentəˌprizəm/Definition of pentaprism 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. pentaprism in other Oxford dictionaries Definition of pentaprism in the British & World English dictionary
