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Scientist in Irish (Eolaí): Meaning, Pronunciation, Usage

‘eolaí’ also means: guide · directory

The Irish for scientist is eolaí, a masculine noun (plural eolaithe).
Updated October 2026Report a mistake

How to say “scientist” in Irish

Irish:
eolaí
English:
scientist, guide, directory
Word type:
noun
Gender:
masculine, fourth declension
Pronunciation:
“OH-lee”  /ˈoːl̪ˠiː/
Various forms
Plural:
eolaithe (scientists)
Genitive singular:
eolaí, an eolaí (e.g. obair an eolaí, the scientist's work)
Genitive plural:
eolaithe, na n-eolaithe (e.g. tuairim na n-eolaithe, the opinion of the scientists)

What does “eolaí” mean?

“Eolaí” has three alternative meanings. The most common comes first.

scientist
A person who studies or works in science.Also: researcher, scholar.
2 other meanings: guide or directory
2guide
A person who knows the way and leads or directs others.Also: leader, pilot.
3directory
A book or list giving names, addresses or other information.Also: guidebook, handbook.

“Eolaí” with the article

The plural of scientist in Irish is eolaithe. Here is eolaí after the article (an t-alt), in the singular and the plural.

an t-eolaí
the scientist
Masculine nouns take t before a vowel after an
na heolaithe
the scientists
Plural: na adds h before a vowel

“Eolaí” in a sentence: Irish examples

Common Irish sentences using eolaí, the Irish word for scientist.

Is eolaí í mo dheirfiúr.
My sister is a scientist.
Labhair an t-eolaí ar an raidió inné.
The scientist spoke on the radio yesterday.
Ba mhaith liom a bheith i m'eolaí.
I would like to be a scientist.
Tá eolaithe ag obair ar an bhfadhb.
Scientists are working on the problem.
Léigh mé alt an eolaí sin.
I read that scientist's article.
Aontaíonn na heolaithe faoin athrú aeráide.
The scientists agree about climate change.
Bhí an t-eolaí ina chónaí sa chathair.
The scientist lived in the city.

Other nouns in Irish

More everyday Irish nouns to learn next.

Scientist in Irish: frequently asked questions

What is the Irish for scientist?

The Irish for scientist is eolaí (pronounced “OH-lee”). It’s a masculine noun and the plural is eolaithe. Depending on context it can also mean guide or directory.

How do you pronounce eolaí in Irish?

Eolaí is said like “OH-lee” (IPA /ˈoːl̪ˠiː/).

What is the plural of scientist in Irish?

The plural of eolaí is eolaithe; with the article, na heolaithe means “the scientists”. The genitive plural is eolaithe, as in tuairim na n-eolaithe (the opinion of the scientists).

Does eolaí have more than one meaning?

Yes. Eolaí can mean scientist, guide or directory, depending on context; the first is the most common.

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

Irish nouns beginning with a vowel take a prefix after certain words: an t-eolaí (the scientist), a heolaí (her scientist), a n-eolaí (their scientist), na heolaithe (the scientists).

How is 'eolaí' related to 'eolas' and 'eolaíocht'?

All come from 'eolas' (knowledge): 'eolaíocht' is science and 'eolaí' is a scientist or someone who knows, hence also a guide.

How do I name specialists like biologist?

Add '-eolaí' to a stem: 'bitheolaí' (biologist), 'síceolaí' (psychologist), matching '-eolaíocht' for the field.

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