Definitions from Wiktionary (prism)

▸ noun:  (geometry) A polyhedron with parallel ends of the same polygonal shape and size, the other faces being parallelogram-shaped sides.
▸ noun:  An object having the shape of a geometrical prism (sense 1).
▸ noun:  (construction) A cutting (“open passage at a level lower than the surrounding terrain, dug for a canal, railway, or road to go through”) or an embankment shaped like a prism (sense 1) or a number of prisms, such that its volume can be easily calculated.
▸ noun:  (crystallography) A crystal in which the faces are parallel to the vertical axis.
▸ noun:  (optics) A transparent block in the shape of a prism (sense 1), typically with triangular ends, used to reflect or refract light.
▸ noun:  (archaic) A spectrum produced by light being refracted through a prism.
▸ noun:  (by extension, surveying) A retroreflector (“device which reflects light back to its source with minimal scattering”) which is usually attached to a surveying pole as a target for a total station which emits a light beam at the device and calculates how long it takes to be reflected back in order to measure distance.
▸ noun:  (figurative) A perspective that colours one's perception.
▸ Also see prism

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