prism

prism

noun \ˈpriz-əm\

Definition of PRISM

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