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Ester in Irish (Eistear): Meaning, Pronunciation, Usage

The Irish for ester is eistear, a masculine noun (plural eistir).
Updated October 2026Report a mistake

How to say “ester” in Irish

Irish:
eistear
English:
ester
Word type:
noun
Gender:
masculine
Pronunciation:
“ESH-tchar”  /ˈeʃtʲəɾ/
Various forms
Plural:
eistir (esters)
Genitive singular:
eistir, an eistir (e.g. foirmle an eistir, formula of the ester)
Genitive plural:
eistear, na n-eistear (e.g. airíonna na n-eistear, the properties of the esters)

What does “eistear” mean?

ester
An ester is a chemical compound formed when an acid reacts with an alcohol, often with a fruity smell.Also: chemical ester, organic ester.

“Eistear” with the article

The plural of ester in Irish is eistir. Here is eistear after the article (an t-alt), in the singular and the plural.

an t-eistear
the ester
Masculine nouns take t before a vowel after an
na heistir
the esters
Plural: na adds h before a vowel

“Eistear” in a sentence: Irish examples

Common Irish sentences using eistear, the Irish word for ester.

Is comhdhúil orgánach é eistear.
An ester is an organic compound.
Déantar an t-eistear as aigéad agus alcól.
The ester is made from an acid and an alcohol.
Tá boladh torthaí ar go leor eistear.
Many esters smell of fruit.
Bíonn eistir i gcumhráin go minic.
Esters are often found in perfumes.
Scríobh an múinteoir foirmle an eistir ar an gclár.
The teacher wrote the formula of the ester on the board.
D'fhoghlaimíomar faoi eistir sa rang ceimice inniu.
We learned about esters in chemistry class today.
Rinne mé eistear sa tsaotharlann.
I made an ester in the laboratory.

Other nouns in Irish

More everyday Irish nouns to learn next.

Ester in Irish: frequently asked questions

What is the Irish for ester?

The Irish for ester is eistear (pronounced “ESH-tchar”). It’s a masculine noun and the plural is eistir.

How do you pronounce eistear in Irish?

Eistear is said like “ESH-tchar” (IPA /ˈeʃtʲəɾ/).

What is the plural of ester in Irish?

The plural of eistear is eistir; with the article, na heistir means “the esters”. The genitive plural is eistear, as in airíonna na n-eistear (the properties of the esters).

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

Irish nouns beginning with a vowel take a prefix after certain words: an t-eistear (the ester), a heistear (her ester), a n-eistear (their ester), na heistir (the esters).

Is 'eistear' the same as 'éitear'?

No. 'Eistear' is an ester, while 'éitear' is an ether, a different type of organic compound.

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