Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “prism”


noun [C]     /ˈprɪzəm/
an object made of clear glass which separates the light that passes through it into different coloursGlassOptics, microscopy and lasersEyesight, glasses and lenses
(Definition of prism noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “prism” in other dictionaries

Word of the Day


showing a wish to help or bring advantages to others, even if it results in disadvantage for yourself

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More