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Frost in Irish (Reo): Meaning, Pronunciation, Usage

‘reo’ also means: freezing

The Irish for frost is reo, a masculine noun. Ag reo is freezing, from the verb reoigh.
Updated October 2026Report a mistake

How to say “frost” in Irish

Irish:
reo
English:
frost, freezing
Word type:
noun (verbal noun)
Verbal noun of:
reoigh, to freeze (ag reo, freezing)
Gender:
masculine, fourth declension
Pronunciation:
“roe”  /ɾˠoː/
Various forms
Genitive singular:
reo, an reo (e.g. oíche reo, a frosty night)

What does “reo” mean?

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

frost
Frost or icy cold weather, when water freezes.Also: freezing weather, ice, hoarfrost.
1 other meaning: freezing
2freezing
The act of freezing or congealing; verbal noun of the verb reoigh.Also: congealing, solidifying.

Other Irish words for frost: sioc (frost), siocán (frost)

“Reo” as a verbal noun

After ag, reo means freezing: it is the verbal noun of the verb reoigh (to freeze). A noun that follows it goes into the genitive.

agat
+
reoverbal noun
=
ag reofreezing

“Reo” with the article

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

an reo
the frost
No change after an

“Reo” in a sentence: Irish examples

Common Irish sentences using reo, the Irish word for frost.

Bhí reo trom ann aréir.
There was a heavy frost last night.
Tá an reo ar an talamh fós.
The frost is still on the ground.
B'oíche reo í, agus bhí na bóithre sleamhain.
It was a frosty night, and the roads were slippery.
Mharaigh an reo na bláthanna sa ghairdín.
The frost killed the flowers in the garden.
Tá sé ag reo amuigh anois.
It is freezing outside now.
Bhí coinnle reo ag crochadh ón díon.
Icicles were hanging from the roof.
Cuir frithreo sa charr roimh an reo.
Put antifreeze in the car before the frost.

Other nouns in Irish

More everyday Irish nouns to learn next.

Frost in Irish: frequently asked questions

What is the Irish for frost?

The Irish for frost is reo (pronounced “roe”). It’s a masculine noun. Depending on context it can also mean freezing.

How do you pronounce reo in Irish?

Reo is said like “roe” (IPA /ɾˠoː/).

Does reo have a plural?

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

Does reo have more than one meaning?

Yes. Reo can mean frost or freezing, depending on context; the first is the most common.

What is the difference between reo and sioc?

Both mean frost; sioc is the more common everyday word for frost, while reo often stresses freezing itself, as in 'ag reo' (freezing).

How do I say 'it is freezing'?

Say 'Tá sé ag reo', using reo as the verbal noun of reoigh.

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