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Tumour in Irish (Siad): Meaning, Pronunciation, Usage

The Irish for tumour is siad, a masculine noun (plural siadaí).
Updated October 2026Report a mistake

How to say “tumour” in Irish

Irish:
siad
English:
tumour
Word type:
noun
Gender:
masculine, third declension
Pronunciation:
“shee-ud”  /ʃiəd/
Various forms
Plural:
siadaí (tumours)
Genitive singular:
siada, an tsiada (e.g. méid an tsiada, the size of the tumour)
Genitive plural:
siadaí, na siadaí (e.g. cóireáil na siadaí, the treatment of the tumours)

What does “siad” mean?

tumour
An abnormal swelling or growth of tissue in the body.Also: tumor, growth, swelling.

“Siad” with the article

The plural of tumour in Irish is siadaí. Here is siad after the article (an t-alt), in the singular and the plural.

an siad
the tumour
No change after an
na siadaí
the tumours
Plural: no change after na

“Siad” in a sentence: Irish examples

Common Irish sentences using siad, the Irish word for tumour.

Fuair an dochtúir siad ar a scamhóg.
The doctor found a tumour on his lung.
Baineadh an siad amach le hobráid.
The tumour was removed by surgery.
Tá méid an tsiada ag laghdú anois.
The size of the tumour is decreasing now.
Ní bhíonn gach siad ailseach.
Not every tumour is cancerous.
Bhí imní uirthi faoin siad ina cíoch.
She was worried about the tumour in her breast.
Rinneadh scanadh chun an siad a aimsiú.
A scan was done to locate the tumour.
Déanann na heolaithe taighde ar shiadaí inchinne.
The scientists research brain tumours.

Other nouns in Irish

More everyday Irish nouns to learn next.

Tumour in Irish: frequently asked questions

What is the Irish for tumour?

The Irish for tumour is siad (pronounced “shee-ud”). It’s a masculine noun and the plural is siadaí.

How do you pronounce siad in Irish?

Siad is said like “shee-ud” (IPA /ʃiəd/).

What is the plural of tumour in Irish?

The plural of siad is siadaí; with the article, na siadaí means “the tumours”. The genitive plural is siadaí, as in cóireáil na siadaí (the treatment of the tumours).

Why does siad change to shiad?

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

Is the noun 'siad' the same word as the pronoun 'siad' meaning 'they'?

No. The noun siad (genitive siada, plural siadaí) means a tumour and is a separate word from the pronoun siad, 'they', which is far more common.

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