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n. a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms n. optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an im…

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  1. n. a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms n. optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image