noun: Any medium that resolves a seemingly simple matter into its elements
noun: a solid object that has a regular shape and can be cut into slices that all have the same shape. A prism usually has two or more sides shaped like a triangle.
noun: a glass object in the shape of a prism, used for dividing light into its different colors
noun: optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image
noun: a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms