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Cancer in Irish (Ailse): Meaning, Pronunciation, Usage

The Irish for cancer is ailse, a feminine noun (plural ailsí).
Updated October 2026Report a mistake

How to say “cancer” in Irish

Irish:
ailse
English:
cancer
Word type:
noun
Gender:
feminine, fourth declension
Pronunciation:
“AL-shuh”  /ˈalʲʃə/
Various forms
Plural:
ailsí (cancers)
Genitive singular:
ailse, na hailse (e.g. cóireáil ailse, cancer treatment)
Genitive plural:
ailsí, na n-ailsí (e.g. cóireáil na n-ailsí, the treatment of the cancers)

What does “ailse” mean?

cancer
A serious disease in which cells in the body grow out of control and form tumours.Also: malignant tumour, carcinoma, malignancy.

“Ailse” with the article

The plural of cancer in Irish is ailsí. Here is ailse after the article (an t-alt), in the singular and the plural.

an ailse
the cancer
No change: feminine nouns starting with a vowel keep their form after an
na hailsí
the cancers
Plural: na adds h before a vowel

“Ailse” in a sentence: Irish examples

Common Irish sentences using ailse, the Irish word for cancer.

Níl aon leigheas éasca ar an ailse.
There is no easy cure for cancer.
Fuair a hathair bás den ailse anuraidh.
Her father died of cancer last year.
Tá ailse scamhóg air, faraor.
He has lung cancer, unfortunately.
Bhí sí ag fáil cóireáil ailse san ospidéal.
She was getting cancer treatment in the hospital.
Is féidir go leor ailsí a leigheas anois.
Many cancers can be cured now.
Bhailigh siad airgead do thaighde ar ailse.
They collected money for cancer research.
Tháinig an ailse ar ais tar éis bliana.
The cancer came back after a year.

Other nouns in Irish

More everyday Irish nouns to learn next.

Cancer in Irish: frequently asked questions

What is the Irish for cancer?

The Irish for cancer is ailse (pronounced “AL-shuh”). It’s a feminine noun and the plural is ailsí.

How do you pronounce ailse in Irish?

Ailse is said like “AL-shuh” (IPA /ˈalʲʃə/).

What is the plural of cancer in Irish?

The plural of ailse is ailsí; with the article, na hailsí means “the cancers”. The genitive plural is ailsí, as in cóireáil na n-ailsí (the treatment of the cancers).

Why does ailse sometimes have a t or h in front of it?

Irish nouns beginning with a vowel take a prefix after certain words: an ailse (the cancer), a hailse (her cancer), a n-ailse (their cancer), na hailsí (the cancers).

Is 'ailse' used for the star sign Cancer?

No, the zodiac sign Cancer is 'an Portán' in Irish; 'ailse' is only the disease.

How do you say someone has cancer?

Use 'ar': 'Tá ailse air' means 'He has cancer', and 'Tá ailse uirthi' means 'She has cancer'.

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