English Reference

Word

prism

US/ˈpɹɪzəm/

UK/pɹˈɪzəm/

Definitions

01optical glass

B2 · Science

n. a transparent glass object that splits white light into a rainbow of different colours.

n. a transparent optical element with polished flat surfaces that refract light, often used to disperse white light into its constituent spectral colours.

“The scientist used a glass prism to show how sunlight is actually made of many colours.”

“By passing a narrow beam of sunlight through a triangular prism, Newton demonstrated that white light is composed of a continuous spectrum of colours.”

Synonyms

refractor

02geometric shape

B2 · Math

n. a solid shape with two ends that are the same size and shape, and flat sides.

n. a polyhedron with two parallel, congruent faces (bases) and additional faces that are parallelograms.

“A rectangular prism looks like a standard cardboard box.”

“The students were asked to calculate the total surface area of a hexagonal prism during their geometry exam.”

Synonyms

polyhedron

03a perspective

C1

n. a particular way of looking at or understanding a situation.

n. a conceptual framework or perspective through which information is filtered or interpreted.

“The author views the entire history of the country through the prism of his own family's experiences.”

“The biographer examined the politician's early career through the prism of post-war social change, offering a fresh interpretation of his motivations.”

Literary

Real-World Examples

“In her view, every decision on energy policy should be judged through the prism of whether it reduces prices.”
BBC News · 15 Apr 2026

Word family

This entry

Level
B2 · Upper Intermediate
Frequency
Frequent
Updated

Scan code

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English Reference