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Prism in Irish (Priosma): Meaning, Pronunciation, Usage

The Irish for prism is priosma, a masculine noun (plural priosmaí).
Updated October 2026Report a mistake

How to say “prism” in Irish

Irish:
priosma
English:
prism
Word type:
noun
Gender:
masculine, fourth declension
Pronunciation:
“PRIS-muh”  /ˈpɾʲɪsˠmˠə/
Various forms
Plural:
priosmaí (prisms)
Genitive singular:
priosma, an phriosma (e.g. taobh an phriosma, the side of the prism)
Genitive plural:
priosmaí, na bpriosmaí (e.g. cruthanna na bpriosmaí, the shapes of the prisms)

What does “priosma” mean?

prism
A solid shape with two identical ends and flat sides, especially a transparent glass one that splits light into colours.Also: glass prism, optical prism.

“Priosma” with the article

The plural of prism in Irish is priosmaí. Here is priosma after the article (an t-alt), in the singular and the plural.

an priosma
the prism
No change after an
na priosmaí
the prisms
Plural: no change after na

“Priosma” in a sentence: Irish examples

Common Irish sentences using priosma, the Irish word for prism.

Scoilteann priosma an solas bán ina dhathanna.
A prism splits white light into colours.
Chuir an múinteoir an priosma ar an mbord.
The teacher put the prism on the table.
Tá cúig aghaidh ar an bpriosma triantánach.
The triangular prism has five faces.
Ríomh toirt an phriosma sa cheist seo.
Calculate the volume of the prism in this question.
Rinneamar staidéar ar phriosmaí sa rang matamaitice.
We studied prisms in maths class.
Chonaic mé bogha báistí i mo phriosma gloine.
I saw a rainbow in my glass prism.
Tá an solas ag lúbadh sa phriosma.
The light is bending in the prism.

Other nouns in Irish

More everyday Irish nouns to learn next.

Prism in Irish: frequently asked questions

What is the Irish for prism?

The Irish for prism is priosma (pronounced “PRIS-muh”). It’s a masculine noun and the plural is priosmaí.

How do you pronounce priosma in Irish?

Priosma is said like “PRIS-muh” (IPA /ˈpɾʲɪsˠmˠə/).

What is the plural of prism in Irish?

The plural of priosma is priosmaí; with the article, na priosmaí means “the prisms”. The genitive plural is priosmaí, as in cruthanna na bpriosmaí (the shapes of the prisms).

Why does priosma change to phriosma or bpriosma?

Irish changes the start of some words after certain words. After mo (my) priosma becomes mo phriosma (lenition), and after ár (our) or i (in) it becomes ár bpriosma (eclipsis).

Is 'priosma' used in both maths and physics?

Yes, 'priosma' means both the geometric solid in maths and the glass prism that splits light in physics.

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