Get the Oxford Advanced American Dictionary app Find out more about Oxford American Dictionaries for learners of English Get an Oxford Advanced American Dictionary searchbox for your website Ask Text Checker

Definition of prism noun from the Oxford Advanced American Dictionary

prism

noun
/ˈprɪzəm/ prism pronunciation American
 
1 (geometry) a solid figure with ends that are parallel and of the same size and shape, and with sides whose opposite edges are equal and parallel2 a transparent glass or plastic object, often with ends in the shape of a triangle, which separates light that passes through it into the colors of the rainbow