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Millimetre in Irish (Milliméadar): Meaning, Pronunciation, Usage

The Irish for millimetre is milliméadar, a masculine noun (plural milliméadair).
Updated October 2026Report a mistake

How to say “millimetre” in Irish

Irish:
milliméadar
English:
millimetre
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“MIL-ee-may-dur”  /ˈmʲɪlʲiˌmʲeːd̪ˠəɾˠ/
Various forms
Plural:
milliméadair (millimetres)
Genitive singular:
milliméadair, an mhilliméadair (e.g. fad milliméadair, a millimetre in length)
Genitive plural:
milliméadar, na milliméadar (e.g. tiús na milliméadar, the thickness in millimetres)

What does “milliméadar” mean?

millimetre
A unit of length equal to one thousandth of a metre.Also: millimeter, mm.

“Milliméadar” with the article

The plural of millimetre in Irish is milliméadair. Here is milliméadar after the article (an t-alt), in the singular and the plural.

an milliméadar
the millimetre
No change after an
na milliméadair
the millimetres
Plural: no change after na

“Milliméadar” in a sentence: Irish examples

Common Irish sentences using milliméadar, the Irish word for millimetre.

Tá an líne seo milliméadar amháin ar leithead.
This line is one millimetre wide.
Tomhais an píosa adhmaid i milliméadair.
Measure the piece of wood in millimetres.
Thit fiche milliméadar báistí aréir.
Twenty millimetres of rain fell last night.
Níl ach cúpla milliméadar idir an dá phíosa.
There are only a couple of millimetres between the two pieces.
Tá deich milliméadar i gceintiméadar.
There are ten millimetres in a centimetre.
Bhog an pictiúr leath mhilliméadair ar chlé.
The picture moved half a millimetre to the left.
Tá an rialóir marcáilte i milliméadair agus i gceintiméadair.
The ruler is marked in millimetres and centimetres.

Other nouns in Irish

More everyday Irish nouns to learn next.

Millimetre in Irish: frequently asked questions

What is the Irish for millimetre?

The Irish for millimetre is milliméadar (pronounced “MIL-ee-may-dur”). It’s a masculine noun and the plural is milliméadair.

How do you pronounce milliméadar in Irish?

Milliméadar is said like “MIL-ee-may-dur” (IPA /ˈmʲɪlʲiˌmʲeːd̪ˠəɾˠ/).

What is the plural of millimetre in Irish?

The plural of milliméadar is milliméadair; with the article, na milliméadair means “the millimetres”. The genitive plural is milliméadar, as in tiús na milliméadar (the thickness in millimetres).

Why does milliméadar change to mhilliméadar?

After words like mo (my) and do (your) the first letter is lenited: mo mhilliméadar. After ár (our) it stays ár milliméadar, because m does not take eclipsis.

How do I say '5 mm' in Irish?

Say 'cúig mhilliméadar'; after numbers the singular form is used, lenited after 2 to 6.

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