A prism refers to a solid geometric figure whose two end faces are similar, equal and parallel rectilinear figures and whose sides are parallelograms. It can also be defined as a glass or other transparent object in this form, especially one that is triangular with refracting surfaces at an acute angle with each other and that separates white light into a spectrum of colours.

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what is the definition of a prism

prism

[priz-uhm]

NOUN

1.

Optics. a transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light.

2.

Geometry a solid having bases or ends that are parallel, congruent polygons and sides that are parallelograms.

3.

Crystallography a form having faces parallel to the vertical axis and intersecting the horizontal axes.

Source:
Dictionary.com

Solid figure with bases that ends of the same size and shape. They are parallel to each other and sides are called a parallelogram. A crystalline body that refract light.

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In geometry, a prism is a polyhedron with an n-sided polygonal base, a translated copy (not in the same plane as the first), and n other faces (necessarily all parallelograms)...