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Mass in Irish (Mais): Meaning, Pronunciation, Usage

‘mais’ also means: lump

The Irish for mass is mais, a feminine noun.
Updated October 2026Report a mistake

How to say “mass” in Irish

Irish:
mais
English:
mass, lump
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“mash”  /mˠaʃ/
Various forms
Genitive singular:
maise, na maise (e.g. lár maise, centre of mass)

What does “mais” mean?

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

mass
In physics, the amount of matter in an object.Also: physical mass, amount of matter.
1 other meaning: lump
2lump
A solid lump or shapeless body of material.Also: mass, bulk.

Other Irish words for mass: meall (lump)

“Mais” with the article

Here is mais after the article (an t-alt).

an mhais
the mass
Lenition: m becomes mh after an (feminine noun)

“Mais” in a sentence: Irish examples

Common Irish sentences using mais, the Irish word for mass.

Tomhaistear mais i gcileagraim.
Mass is measured in kilograms.
Ní hionann mais agus meáchan.
Mass is not the same as weight.
Cad é mais na cloiche seo?
What is the mass of this stone?
Fanann an mhais mar an gcéanna ar an ngealach.
The mass stays the same on the moon.
Aimsigh lár maise an choirp.
Find the centre of mass of the body.
Tá mais mhór ag an bplainéad sin.
That planet has a large mass.
Bhí mais chré ar an mbord.
There was a lump of clay on the table.

Other nouns in Irish

More everyday Irish nouns to learn next.

Mass in Irish: frequently asked questions

What is the Irish for mass?

The Irish for mass is mais (pronounced “mash”). It’s a feminine noun. Depending on context it can also mean lump.

How do you pronounce mais in Irish?

Mais is said like “mash” (IPA /mˠaʃ/).

Does mais have a plural?

No plural form is given for mais in the standard. Many abstract and mass nouns in Irish have no plural.

Does mais have more than one meaning?

Yes. Mais can mean mass or lump, depending on context; the first is the most common.

Why does mais change to mhais?

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

Is 'mais' the same as 'meáchan'?

No. 'Mais' is the amount of matter in an object, while 'meáchan' is weight, the force of gravity on it.

Does 'mais' mean Mass in church?

No. The religious Mass is 'Aifreann'; 'mais' is mass in the physical sense.

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