prism
PRIZ-um
/ˈprɪz.əm/
A transparent solid geometric object with flat polished faces that refracts light; or a perspective that reshapes interpretation.
Optically bends, scatters, or reflects light beams; metaphorically acts as a conceptual framework or viewpoint.
The story behind the word. From Ancient Greek 'prizma', meaning 'that which is sawed off'. Early geometricians named triangular glass blocks prisms because they looked like sawed-off sections of a long triangular wooden beam.
Word relationships
- refractor: Refractor refers to any light-bending system, while prism denotes a distinct flat-faced geometric solid.
- lens: A lens has curved surfaces that focus light, while a prism has flat planar faces that disperse or turn light.
Commonly confused with
- pyramid: A pyramid comes to a point at the top; a prism maintains identical triangular end-faces along its length.
Word family
- prismatic (adjective): Relating to or shaped like a prism; showing brilliant rainbow colors.
Collocations
- glass prism
- triangular prism
- through the prism of
- optical prism
Idioms & expressions
- through the prism of
Example sentences
- "By aligning a narrow beam of sunlight through a glass prism, Newton proved that white light is a blend of rainbow colors." Classical physics experiment
- "The historian analyzed the industrial revolution through the prism of labor rights and urban working conditions." Social critique
Memory hook
A PRISM splits light into a PRISMATIC rainbow! Sawed glass block that splits light.
When not to use
Do not use to describe curved optical lenses or circular mirrors.
Fun facts
- Binoculars use internal Porro prisms to invert upside-down images right-side up without making the optical tubes long.
Related words
Explore more words
transparent, perspective, reframe, paradigm, truss, multifaceted
Take your vocabulary further with LangBlitz
Our English vocabulary app: FSRS spaced repetition, 5,000+ curated words across 119 topic groups, CEFR A1 to C2. Explore your mastery with the beautiful Vocabulary World feature.