HeyRua Get the app

Triangle in Irish (Triantán): Meaning, Pronunciation, Usage

‘triantán’ also means: triangle (musical instrument) · triangular piece

The Irish for triangle is triantán, a masculine noun (plural triantáin).
Updated October 2026Report a mistake

How to say “triangle” in Irish

Irish:
triantán
English:
triangle, triangle (musical instrument), triangular piece
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“TRIH-un-tawn”  /ˈtʲɾʲiən̪ˠt̪ˠɑːn̪ˠ/
Various forms
Plural:
triantáin (triangles)
Genitive singular:
triantáin, an triantáin (e.g. taobhanna an triantáin, the sides of the triangle)
Genitive plural:
triantán, na dtriantán (e.g. cineálacha na dtriantán, the types of the triangles)

What does “triantán” mean?

“Triantán” has three alternative meanings. The most common comes first.

triangle
A flat shape with three straight sides and three angles.Also: three-sided shape.
2 other meanings: triangle (musical instrument) or triangular piece
2triangle (musical instrument)
A small percussion instrument made of a metal bar bent into a triangle and struck with a rod.Also: triangle, percussion triangle.
3triangular piece
A wedge or triangular section of something, such as a slice of cake or a piece of land.Also: wedge, delta.

“Triantán” with the article

The plural of triangle in Irish is triantáin. Here is triantán after the article (an t-alt), in the singular and the plural.

an triantán
the triangle
No change after an
na triantáin
the triangles
Plural: no change after na

“Triantán” in a sentence: Irish examples

Common Irish sentences using triantán, the Irish word for triangle.

Tarraing triantán ar an leathanach.
Draw a triangle on the page.
Tá trí uillinn ag an triantán.
The triangle has three angles.
Cad é achar an triantáin seo?
What is the area of this triangle?
Ghearr sí an cáca ina thriantáin.
She cut the cake into triangles.
Seinneann mo dheartháir an triantán sa bhanna.
My brother plays the triangle in the band.
Tá an bhratach i gcruth triantáin.
The flag is shaped like a triangle.
D'fhoghlaimíomar faoi thriantáin sa rang mata inniu.
We learned about triangles in maths class today.

Other nouns in Irish

More everyday Irish nouns to learn next.

Triangle in Irish: frequently asked questions

What is the Irish for triangle?

The Irish for triangle is triantán (pronounced “TRIH-un-tawn”). It’s a masculine noun and the plural is triantáin. Depending on context it can also mean triangle (musical instrument) or triangular piece.

How do you pronounce triantán in Irish?

Triantán is said like “TRIH-un-tawn” (IPA /ˈtʲɾʲiən̪ˠt̪ˠɑːn̪ˠ/).

What is the plural of triangle in Irish?

The plural of triantán is triantáin; with the article, na triantáin means “the triangles”. The genitive plural is triantán, as in cineálacha na dtriantán (the types of the triangles).

Does triantán have more than one meaning?

Yes. Triantán can mean triangle, triangle (musical instrument) or triangular piece, depending on context; the first is the most common.

Why does triantán change to thriantán or dtriantán?

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

What is the adjective meaning 'triangular'?

The adjective is 'triantánach', as in 'píosa triantánach' (a triangular piece).

Learn Irish by
actually speaking it

Learn everyday Irish words like triantán through guided conversation with Rua.

7-day free trial. Cancel anytime.

The HeyRua app home screen