Main Entry: prism

Pronunciation: \ˈpriz-əm\

Function: noun

1 : a polyhedron with two polygonal faces lying in parallel planes and with the other faces parallelograms
2 : a transparent body that is bounded in part by two nonparallel plane faces and is used to refract or disperse a beam of light
3 : a crystal form whose faces are parallel to one axis ; especially : one whose faces are parallel to the vertical axis