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Oestrus in Irish (Éastras): Meaning, Pronunciation, Usage

The Irish for oestrus is éastras, a masculine noun.
Updated October 2026Report a mistake

How to say “oestrus” in Irish

Irish:
éastras
English:
oestrus
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“AYS-trus”  /ˈeːsˠt̪ˠɾˠəsˠ/
Various forms
Genitive singular:
éastrais, an éastrais (e.g. tréimhse an éastrais, the period of oestrus)

What does “éastras” mean?

oestrus
The period when a female animal is ready to mate, also called being in heat.Also: estrus, heat, rut, season.

“Éastras” with the article

Here is éastras after the article (an t-alt).

an t-éastras
the oestrus
Masculine nouns take t before a vowel after an

“Éastras” in a sentence: Irish examples

Common Irish sentences using éastras, the Irish word for oestrus.

Tá an bhó in éastras inniu.
The cow is in heat today.
Maireann an t-éastras cúpla lá.
Oestrus lasts a couple of days.
Thug an feirmeoir faoi deara comharthaí éastrais.
The farmer noticed signs of oestrus.
Is iondúil go dtagann éastras gach trí seachtaine.
Oestrus usually comes every three weeks.
Bíonn an tsoith corrthónach le linn an éastrais.
The bitch is restless during oestrus.
Tá timthriall an éastrais tábhachtach don phórú.
The oestrus cycle is important for breeding.
Labhair an tréidlia faoin éastras sa rang.
The vet talked about oestrus in class.

Other nouns in Irish

More everyday Irish nouns to learn next.

Oestrus in Irish: frequently asked questions

What is the Irish for oestrus?

The Irish for oestrus is éastras (pronounced “AYS-trus”). It’s a masculine noun.

How do you pronounce éastras in Irish?

Éastras is said like “AYS-trus” (IPA /ˈeːsˠt̪ˠɾˠəsˠ/).

Does éastras have a plural?

No plural form is given for éastras in the standard. Many abstract and mass nouns in Irish have no plural.

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

Irish nouns beginning with a vowel take a prefix after certain words: an t-éastras (the oestrus), a héastras (her oestrus), a n-éastras (their oestrus).

Is there a more everyday word than 'éastras' for an animal in heat?

Yes, farmers usually say a cow is 'faoi dháir' and a sow 'faoi láth'; 'éastras' is the scientific term.

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