HeyRua Get the app

Grandfather in Irish (Seanathair): Meaning, Pronunciation, Usage

The Irish for grandfather is seanathair, a masculine noun (plural seanaithreacha).
Updated October 2026Report a mistake

How to say “grandfather” in Irish

Irish:
seanathair
English:
grandfather
Word type:
noun
Gender:
masculine, fifth declension
Pronunciation:
“SHAN-a-hir”  /ˈʃanˠahəɾʲ/
Various forms
Plural:
seanaithreacha (grandfathers)
Genitive singular:
seanathar, an tseanathar (e.g. teach mo sheanathar, my grandfather's house)
Genitive plural:
seanaithreacha, na seanaithreacha (e.g. scéalta ár seanaithreacha, our grandfathers' stories)

What does “seanathair” mean?

grandfather
The father of your mother or father.Also: grandad, granddad, grandpa.

“Seanathair” with the article

The plural of grandfather in Irish is seanaithreacha. Here is seanathair after the article (an t-alt), in the singular and the plural.

an seanathair
the grandfather
No change after an
na seanaithreacha
the grandfathers
Plural: no change after na

“Seanathair” in a sentence: Irish examples

Common Irish sentences using seanathair, the Irish word for grandfather.

Tá mo sheanathair ochtó bliain d'aois.
My grandfather is eighty years old.
Chuaigh mé ar cuairt chuig mo sheanathair inné.
I visited my grandfather yesterday.
Bhí an seanathair ina shuí cois tine.
The grandfather was sitting by the fire.
Is é seo cóta mo sheanathar.
This is my grandfather's coat.
Bhí an dá sheanathair ag an gcóisir.
Both grandfathers were at the party.
Tá seanathair Sheáin ina chónaí i gCorcaigh.
Seán's grandfather lives in Cork.
D'inis a seanathair scéal di.
Her grandfather told her a story.

Other nouns in Irish

More everyday Irish nouns to learn next.

Grandfather in Irish: frequently asked questions

What is the Irish for grandfather?

The Irish for grandfather is seanathair (pronounced “SHAN-a-hir”). It’s a masculine noun and the plural is seanaithreacha.

How do you pronounce seanathair in Irish?

Seanathair is said like “SHAN-a-hir” (IPA /ˈʃanˠahəɾʲ/).

What is the plural of grandfather in Irish?

The plural of seanathair is seanaithreacha; with the article, na seanaithreacha means “the grandfathers”. The genitive plural is seanaithreacha, as in scéalta ár seanaithreacha (our grandfathers' stories).

Why does seanathair change to sheanathair?

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

Is there a more informal word for grandad?

Many children say 'daideo' for grandad, while 'seanathair' is the standard dictionary word.

How do I say great-grandfather?

Use 'sin-seanathair' for great-grandfather.

Learn Irish by
actually speaking it

Learn everyday Irish words like seanathair through guided conversation with Rua.

7-day free trial. Cancel anytime.

The HeyRua app home screen