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Diameter in Irish (Lárlíne): Meaning, Pronunciation, Usage

‘lárlíne’ also means: centre line

The Irish for diameter is lárlíne, a feminine noun (plural lárlínte).
Updated October 2026Report a mistake

How to say “diameter” in Irish

Irish:
lárlíne
English:
diameter, centre line
Word type:
noun
Gender:
feminine, fourth declension
Pronunciation:
“LAWR-lee-nyuh”  /ˈl̪ˠaːɾˌlʲiːnʲə/
Various forms
Plural:
lárlínte (diameters)
Genitive singular:
lárlíne, na lárlíne (e.g. fad na lárlíne, length of the diameter)
Genitive plural:
lárlínte, na lárlínte (e.g. faid na lárlínte, lengths of the diameters)

What does “lárlíne” mean?

“Lárlíne” has two alternative meanings. The most common comes first.

diameter
A straight line passing through the centre of a circle or sphere from one side to the other.
1 other meaning: centre line
2centre line
A line running through the middle of something, such as a pitch, road or drawing.Also: center line, centreline, median line.

“Lárlíne” with the article

The plural of diameter in Irish is lárlínte. Here is lárlíne after the article (an t-alt), in the singular and the plural.

an lárlíne
the diameter
No change after an
na lárlínte
the diameters
Plural: no change after na

“Lárlíne” in a sentence: Irish examples

Common Irish sentences using lárlíne, the Irish word for diameter.

Tarraing lárlíne tríd an gciorcal.
Draw a diameter through the circle.
Is é an lárlíne dhá oiread an gha.
The diameter is twice the radius.
Cad é fad na lárlíne?
What is the length of the diameter?
Tá na lárlínte go léir ar comhfhad.
All the diameters are the same length.
Thomhais mé an lárlíne le rialóir.
I measured the diameter with a ruler.
Sheas an réiteoir ar an lárlíne.
The referee stood on the centre line.
Tá botún i mo lárlíne sa líníocht.
There is a mistake in my centre line in the drawing.

Other nouns in Irish

More everyday Irish nouns to learn next.

Diameter in Irish: frequently asked questions

What is the Irish for diameter?

The Irish for diameter is lárlíne (pronounced “LAWR-lee-nyuh”). It’s a feminine noun and the plural is lárlínte. Depending on context it can also mean centre line.

How do you pronounce lárlíne in Irish?

Lárlíne is said like “LAWR-lee-nyuh” (IPA /ˈl̪ˠaːɾˌlʲiːnʲə/).

What is the plural of diameter in Irish?

The plural of lárlíne is lárlínte; with the article, na lárlínte means “the diameters”. The genitive plural is lárlínte, as in faid na lárlínte (lengths of the diameters).

Does lárlíne have more than one meaning?

Yes. Lárlíne can mean diameter or centre line, depending on context; the first is the most common.

Is 'lárlíne' the same as 'trastomhas'?

Both can mean diameter; 'trastomhas' is the usual term for the measurement in schools, while 'lárlíne' stresses the line through the centre.

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