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Perimeter in Irish (Peiriméadar): Meaning, Pronunciation, Usage

The Irish for perimeter is peiriméadar, a masculine noun (plural peiriméadair).
Updated October 2026Report a mistake

How to say “perimeter” in Irish

Irish:
peiriméadar
English:
perimeter
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“PERR-i-may-dur”  /ˈpʲɛɾʲəmʲeːd̪ˠəɾ/
Various forms
Plural:
peiriméadair (perimeters)
Genitive singular:
peiriméadair, an pheiriméadair (e.g. fad an pheiriméadair, length of the perimeter)
Genitive plural:
peiriméadar, na bpeiriméadar (e.g. ag comparáid peiriméadar, comparing perimeters)

What does “peiriméadar” mean?

perimeter
The outer boundary of a shape or area, or the total length of that boundary.Also: boundary, circumference, outer edge.

“Peiriméadar” with the article

The plural of perimeter in Irish is peiriméadair. Here is peiriméadar after the article (an t-alt), in the singular and the plural.

an peiriméadar
the perimeter
No change after an
na peiriméadair
the perimeters
Plural: no change after na

“Peiriméadar” in a sentence: Irish examples

Common Irish sentences using peiriméadar, the Irish word for perimeter.

Cén peiriméadar atá ag an gcearnóg seo?
What is the perimeter of this square?
Ríomh an peiriméadar sula dtosóidh tú.
Calculate the perimeter before you start.
Is fiche méadar fad an pheiriméadair.
The perimeter is twenty metres long.
Tá peiriméadair na dtriantán sin cothrom.
The perimeters of those triangles are equal.
Shiúil na gardaí timpeall ar pheiriméadar an champa.
The guards walked around the perimeter of the camp.
Fuair mé an peiriméadar mícheart sa scrúdú.
I got the perimeter wrong in the exam.
Cuireadh fál ar an bpeiriméadar ar fad.
A fence was put along the whole perimeter.

Other nouns in Irish

More everyday Irish nouns to learn next.

Perimeter in Irish: frequently asked questions

What is the Irish for perimeter?

The Irish for perimeter is peiriméadar (pronounced “PERR-i-may-dur”). It’s a masculine noun and the plural is peiriméadair.

How do you pronounce peiriméadar in Irish?

Peiriméadar is said like “PERR-i-may-dur” (IPA /ˈpʲɛɾʲəmʲeːd̪ˠəɾ/).

What is the plural of perimeter in Irish?

The plural of peiriméadar is peiriméadair; with the article, na peiriméadair means “the perimeters”. The genitive plural is peiriméadar, as in ag comparáid peiriméadar (comparing perimeters).

Why does peiriméadar change to pheiriméadar or bpeiriméadar?

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

What is the difference between 'peiriméadar' and 'imlíne'?

'Peiriméadar' is the usual maths term for perimeter, while 'imlíne' means circumference or outline, especially of a circle.

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