prism

prism — noun

1. a geometric solid whose two end faces are identical flat polygons, connected by

1.nounB1
Definition

a geometric solid whose two end faces are identical flat polygons, connected by side faces that are parallelograms or rectangles

Example

Takeshi built a triangular prism from cardboard for the school science fair.

built from cardboard — shows material collocation

In geometry class, Kabir learned how to calculate the volume of a rectangular prism.

Common collocations
  • triangular prism
  • rectangular prism
  • hexagonal prism
  • prism made of
  • pentagonal prism
Synonyms
  • polyhedron

    broader category — all prisms are polyhedra, but many polyhedra are not prisms

  • solid

    more general term for any 3D object, not specific to prisms

Grammar Patterns

a [adjective] prism

prism + made of/from [material]

prism with [number]-sided ends

Usage Note

Often appears with a prefix describing the shape of the end faces, such as triangular, rectangular, or hexagonal.

Common Mistakes

A prism is a shape with circles on both ends.
A prism has two identical flat ends, not round ones.
Prisms have polygonal faces, not circular bases.
A cube is not a prism.
A cube is a special kind of rectangular prism.
A cube is actually a type of prism with square faces.

2. a see-through object, usually triangular in shape, that bends light and splits w

2.nounB1
Definition

a see-through object, usually triangular in shape, that bends light and splits white light apart into the separate colours contained within it

Example

When sunlight passes through a glass prism, bands of colour appear on the wall.

passes through a [glass] prism — shows light + prism collocation

Hassan held the crystal prism up to the window and watched the rainbow form.

Common collocations
  • glass prism
  • crystal prism
  • light passes through a prism
  • triangular prism

Grammar Patterns

a [material] prism

prism + bends/splits/divides [light]

through a/the prism

Usage Note

In everyday English, prism usually refers to this optical device rather than the mathematical shape. The triangular form is the most common type.

Common Mistakes

A prism makes new colours appear.
A prism separates white light into the colours that are already in it.
The colours are part of the light, not created by the prism.

3. a way of looking at or thinking about a situation that changes or shapes your un

3.nounB2
Definition

a way of looking at or thinking about a situation that changes or shapes your understanding of it — like seeing a film through the prism of your own life experience

Example

Beatrix tried to see the argument through the prism of her grandmother's experience during the war.

through the prism of — core figurative pattern expanded with context

The documentary offered a new prism through which to view the country's history.

prism through which to view — extended pattern

Common collocations
  • through the prism of
  • a different prism
  • a new prism
  • a unique prism
Synonyms
  • perspective

    more neutral and common — lacks the connotation of bending or colouring that prism carries

  • lens

    very close synonym, also suggests a filter that shapes perception

  • angle

    suggests a specific viewpoint or approach rather than a broad worldview

Grammar Patterns

through the prism of [something]

a different prism

a new prism

Usage Note

Always used figuratively in this sense. The phrase through the prism of is by far the most common pattern. Frequently describes how personal experience, culture, or ideology shapes perception.

Common Mistakes

I see life through a prism.
I see life through the prism of my cultural upbringing.
The figurative sense needs a modifier or context to specify what is shaping the view.

Word family

  • prismatic
    adjectiveC1
  • prism-like
    adjectiveB2

Synonym discussion

Sense: noun/3

These words all describe a way of seeing or understanding something, but they differ in connotation. Prism (in the figurative sense) suggests that something actively changes or distorts the view — like light being bent through glass — making it a more vivid, image-driven choice. Lens is very similar: it implies a filter that shapes what you perceive. Perspective is the most neutral and commonly used; it simply describes someone's position or standpoint without suggesting distortion. Angle focuses on a specific aspect or approach to an issue, often in a strategic or argumentative context ('try a different marketing angle'). Viewpoint is close to perspective but slightly more personal and opinion-based. For everyday writing, perspective or viewpoint are the safest choices; use prism or lens when you want a more literary, metaphorical tone.

prism ↗perspective ↗lens ↗angle ↗viewpoint ↗

Common collocations

Nouns

  • glass prism
  • crystal prism
  • triangular prism
  • rectangular prism
  • light prism

Phrases

  • act as a prism
  • through the prism of
  • a prism of [something]

Prepositions

  • through a prism
  • through the prism of

Etymology

GreekLatinEnglish

The word prism comes from the Greek word 'prisma' meaning 'something that has been sawed off,' derived from the verb 'prizein' (to saw). This is because a prism's flat, angled faces resemble the cut surfaces of a sawed-off piece of wood or stone. The mathematical sense appeared in English in the mid-1500s, and the optical sense followed in the early 1600s when scientists like Isaac Newton began using glass prisms to study light and colour.