Толковый словарь английского языка Oxford English Reference - pentaprism

n. a five-sided prism with two silvered surfaces used in a viewfinder to obtain a constant deviation of all rays of light through 90°. PENTATEUCH n. the first five books of the Old Testament, traditionally ascribed to Moses. Derivatives pentateuchal adj. Etymology: eccl.L pentateuchus f. eccl.Gk pentateukhos (as PENTA-, teukhos implement, book)