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Flu in Irish (Fliú): Meaning, Pronunciation, Usage

The Irish for flu is fliú, a masculine noun.
Updated October 2026Report a mistake

How to say “flu” in Irish

Irish:
fliú
English:
flu
Word type:
noun
Gender:
masculine, fourth declension
Pronunciation:
“flyoo”  /fʲlʲuː/
Various forms
Genitive singular:
fliú, an fhliú (e.g. vacsaín an fhliú, the flu vaccine)

What does “fliú” mean?

flu
A common infectious illness that causes fever, aches and a cough; influenza.Also: influenza, the flu.

“Fliú” with the article

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

an fliú
the flu
No change after an

“Fliú” in a sentence: Irish examples

Common Irish sentences using fliú, the Irish word for flu.

Tá fliú orm inniu.
I have the flu today.
Bhí an fliú ar an teaghlach ar fad.
The whole family had the flu.
Fuair mé vacsaín an fhliú inné.
I got the flu vaccine yesterday.
Tá an fliú ag dul thart sa scoil.
The flu is going around the school.
Chaith sé seachtain sa leaba leis an bhfliú.
He spent a week in bed with the flu.
Is é séasúr an fhliú é anois.
It's flu season now.
Níor tháinig sí isteach mar go raibh fliú uirthi.
She didn't come in because she had the flu.

Other nouns in Irish

More everyday Irish nouns to learn next.

Flu in Irish: frequently asked questions

What is the Irish for flu?

The Irish for flu is fliú (pronounced “flyoo”). It’s a masculine noun.

How do you pronounce fliú in Irish?

Fliú is said like “flyoo” (IPA /fʲlʲuː/).

Does fliú have a plural?

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

Why does fliú change to fhliú or bhfliú?

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

How do I say I have the flu in Irish?

Use 'ar': 'Tá an fliú orm' or 'Tá fliú orm', literally the flu is on me.

What is the difference between 'fliú' and 'slaghdán'?

'Slaghdán' is a cold, a milder illness, while 'fliú' is influenza, which is more severe.

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