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Theorem in Irish (Teoirim): Meaning, Pronunciation, Usage

The Irish for theorem is teoirim, a feminine noun (plural teoirimí).
Updated October 2026Report a mistake

How to say “theorem” in Irish

Irish:
teoirim
English:
theorem
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“TYOR-im”  /tʲoːɾʲəmʲ/
Various forms
Plural:
teoirimí (theorems)
Genitive singular:
teoirime, na teoirime (e.g. cruthúnas na teoirime, proof of the theorem)
Genitive plural:
teoirimí, na dteoirimí (e.g. cruthúnais na dteoirimí, the proofs of the theorems)

What does “teoirim” mean?

theorem
A statement in mathematics or logic that can be proved from accepted principles.Also: mathematical theorem, proposition.

“Teoirim” with the article

The plural of theorem in Irish is teoirimí. Here is teoirim after the article (an t-alt), in the singular and the plural.

an teoirim
the theorem
No change: d and t are not lenited after an
na teoirimí
the theorems
Plural: no change after na

“Teoirim” in a sentence: Irish examples

Common Irish sentences using teoirim, the Irish word for theorem.

Is teoirim cháiliúil í teoirim Phíotagaráis.
Pythagoras' theorem is a famous theorem.
Chruthaigh an múinteoir an teoirim ar an gclár.
The teacher proved the theorem on the board.
Níor thuig mé cruthúnas na teoirime ar chor ar bith.
I didn't understand the proof of the theorem at all.
Tá go leor teoirimí le foghlaim don scrúdú.
There are lots of theorems to learn for the exam.
Rinne mé dearmad ar mo theoirim sa scrúdú.
I forgot my theorem in the exam.
Tá an fhoirmle sin bunaithe ar theoirim Euclid.
That formula is based on Euclid's theorem.
Sa cheacht inniu déanfaimid staidéar ar theoirim nua.
In today's lesson we will study a new theorem.

Other nouns in Irish

More everyday Irish nouns to learn next.

Theorem in Irish: frequently asked questions

What is the Irish for theorem?

The Irish for theorem is teoirim (pronounced “TYOR-im”). It’s a feminine noun and the plural is teoirimí.

How do you pronounce teoirim in Irish?

Teoirim is said like “TYOR-im” (IPA /tʲoːɾʲəmʲ/).

What is the plural of theorem in Irish?

The plural of teoirim is teoirimí; with the article, na teoirimí means “the theorems”. The genitive plural is teoirimí, as in cruthúnais na dteoirimí (the proofs of the theorems).

Why does teoirim change to theoirim or dteoirim?

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

What is the difference between teoirim and teoiric?

Teoirim is a proven mathematical theorem, while teoiric is a theory, an idea or system of ideas meant to explain something.

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