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Pentagon in Irish (Peinteagán): Meaning, Pronunciation, Usage

The Irish for pentagon is peinteagán, a masculine noun (plural peinteagáin).
Updated October 2026Report a mistake

How to say “pentagon” in Irish

Irish:
peinteagán
English:
pentagon
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“PEN-tyuh-gawn”  /ˈpʲɛnʲtʲəɡɑːn/
Various forms
Plural:
peinteagáin (pentagons)
Genitive singular:
peinteagáin, an pheinteagáin (e.g. taobhanna an pheinteagáin, the sides of the pentagon)
Genitive plural:
peinteagán, na bpeinteagán (e.g. líníocht na bpeinteagán, the drawing of pentagons)

What does “peinteagán” mean?

pentagon
A flat shape with five straight sides and five angles.Also: five-sided shape, five-sided figure.

“Peinteagán” with the article

The plural of pentagon in Irish is peinteagáin. Here is peinteagán after the article (an t-alt), in the singular and the plural.

an peinteagán
the pentagon
No change after an
na peinteagáin
the pentagons
Plural: no change after na

“Peinteagán” in a sentence: Irish examples

Common Irish sentences using peinteagán, the Irish word for pentagon.

Tá cúig thaobh ar pheinteagán.
A pentagon has five sides.
Tarraing peinteagán i do chóipleabhar.
Draw a pentagon in your copybook.
Tomhais uillinneacha an pheinteagáin.
Measure the angles of the pentagon.
Tá an peinteagán seo rialta.
This pentagon is regular.
Ghearr na páistí peinteagáin as páipéar daite.
The children cut pentagons out of coloured paper.
Tá mo pheinteagán beagán cam.
My pentagon is a bit crooked.
Cé mhéad triantán atá sa pheinteagán?
How many triangles are in the pentagon?

Other nouns in Irish

More everyday Irish nouns to learn next.

Pentagon in Irish: frequently asked questions

What is the Irish for pentagon?

The Irish for pentagon is peinteagán (pronounced “PEN-tyuh-gawn”). It’s a masculine noun and the plural is peinteagáin.

How do you pronounce peinteagán in Irish?

Peinteagán is said like “PEN-tyuh-gawn” (IPA /ˈpʲɛnʲtʲəɡɑːn/).

What is the plural of pentagon in Irish?

The plural of peinteagán is peinteagáin; with the article, na peinteagáin means “the pentagons”. The genitive plural is peinteagán, as in líníocht na bpeinteagán (the drawing of pentagons).

Why does peinteagán change to pheinteagán or bpeinteagán?

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

How do I say hexagon and octagon in the same pattern?

They follow the same model: 'heicseagán' for hexagon and 'ochtagán' for octagon, alongside 'peinteagán'.

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