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Demonstrator in Irish (Léirsitheoir): Meaning, Pronunciation, Usage

‘léirsitheoir’ also means: demonstrator (teaching)

The Irish for demonstrator is léirsitheoir, a masculine noun (plural léirsitheoirí).
Updated October 2026Report a mistake

How to say “demonstrator” in Irish

Irish:
léirsitheoir
English:
demonstrator, demonstrator (teaching)
Word type:
noun
Gender:
masculine, third declension
Pronunciation:
“LAYR-shih-hore”  /ˈlʲeːɾˠʃəhoːɾʲ/
Various forms
Plural:
léirsitheoirí (demonstrators)
Genitive singular:
léirsitheora, an léirsitheora (e.g. ainm an léirsitheora, the demonstrator's name)
Genitive plural:
léirsitheoirí, na léirsitheoirí (e.g. slua na léirsitheoirí, the crowd of demonstrators)

What does “léirsitheoir” mean?

“Léirsitheoir” has two alternative meanings. The most common comes first.

demonstrator
A person who takes part in a public protest or demonstration.Also: protester, marcher.
1 other meaning: demonstrator (teaching)
2demonstrator (teaching)
A person who demonstrates or shows how something works, for example in a laboratory class.Also: demonstrator, laboratory demonstrator, instructor.

Other Irish words for demonstrator: agóideoir (protester)

“Léirsitheoir” with the article

The plural of demonstrator in Irish is léirsitheoirí. Here is léirsitheoir after the article (an t-alt), in the singular and the plural.

an léirsitheoir
the demonstrator
No change after an
na léirsitheoirí
the demonstrators
Plural: no change after na

“Léirsitheoir” in a sentence: Irish examples

Common Irish sentences using léirsitheoir, the Irish word for demonstrator.

Gabhadh léirsitheoir os comhair na Dála inné.
A demonstrator was arrested outside the Dáil yesterday.
Bhí na léirsitheoirí ag máirseáil síos an tsráid.
The demonstrators were marching down the street.
Labhair an léirsitheoir leis na hiriseoirí.
The demonstrator spoke to the journalists.
Bhí comhartha mór i lámh an léirsitheora.
The demonstrator had a big sign in his hand.
Tháinig míle léirsitheoir go dtí an chearnóg.
A thousand demonstrators came to the square.
Bhí mo dheartháir ina léirsitheoir sa tsaotharlann.
My brother was a demonstrator in the lab.
Chuir na gardaí stop le cuid de na léirsitheoirí.
The guards stopped some of the demonstrators.

Other nouns in Irish

More everyday Irish nouns to learn next.

Demonstrator in Irish: frequently asked questions

What is the Irish for demonstrator?

The Irish for demonstrator is léirsitheoir (pronounced “LAYR-shih-hore”). It’s a masculine noun and the plural is léirsitheoirí. Depending on context it can also mean demonstrator (teaching).

How do you pronounce léirsitheoir in Irish?

Léirsitheoir is said like “LAYR-shih-hore” (IPA /ˈlʲeːɾˠʃəhoːɾʲ/).

What is the plural of demonstrator in Irish?

The plural of léirsitheoir is léirsitheoirí; with the article, na léirsitheoirí means “the demonstrators”. The genitive plural is léirsitheoirí, as in slua na léirsitheoirí (the crowd of demonstrators).

Does léirsitheoir have more than one meaning?

Yes. Léirsitheoir can mean demonstrator or demonstrator (teaching), depending on context; the first is the most common.

What is the difference between léirsitheoir and agóideoir?

Léirsitheoir is someone taking part in a demonstration (léirsiú), while agóideoir is a protester in a broader sense; in practice they often overlap.

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