HeyRua Get the app

Hardening in Irish (Cruachan): Meaning, Pronunciation, Usage

‘cruachan’ also means: tempering

The Irish for hardening is cruachan, a feminine noun. Ag cruachan is hardening, from the verb cruaigh.
Updated October 2026Report a mistake

How to say “hardening” in Irish

Irish:
cruachan
English:
hardening, tempering
Word type:
noun (verbal noun)
Verbal noun of:
cruaigh, to harden (ag cruachan, hardening)
Gender:
feminine, third declension
Pronunciation:
“KROO-uh-khun”  /ˈkɾˠuəxənˠ/
Various forms
Genitive singular:
cruachana, na cruachana (e.g. próiseas na cruachana, the process of hardening)

What does “cruachan” mean?

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

hardening
The verbal noun of cruaigh: the act or process of making something hard or becoming hard.Also: toughening, tempering, solidifying.
1 other meaning: tempering
2tempering
The process of hardening metal such as steel by heating and cooling it.Also: hardening of steel, case-hardening.

“Cruachan” as a verbal noun

After ag, cruachan means hardening: it is the verbal noun of the verb cruaigh (to harden). A noun that follows it goes into the genitive.

agat
+
cruachanverbal noun
=
ag cruachanhardening

“Cruachan” with the article

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

an chruachan
the hardening
Lenition: c becomes ch after an (feminine noun)

“Cruachan” in a sentence: Irish examples

Common Irish sentences using cruachan, the Irish word for hardening.

Tógann cruachan na stroighne cúpla lá.
The concrete takes a couple of days to harden.
Tá an chruachan ag tosú cheana féin.
The hardening is already starting.
Is cuid thábhachtach den obair í an chruachan.
Hardening is an important part of the work.
Mhínigh an gabha próiseas na cruachana dúinn.
The blacksmith explained the hardening process to us.
Bíonn teas ard ag teastáil le haghaidh cruachana.
High heat is needed for hardening.
Tharla cruachan sna hartairí de réir a chéile.
Hardening occurred gradually in the arteries.
Tá an chré ag cruachan sa ghrian.
The clay is hardening in the sun.

Other nouns in Irish

More everyday Irish nouns to learn next.

Hardening in Irish: frequently asked questions

What is the Irish for hardening?

The Irish for hardening is cruachan (pronounced “KROO-uh-khun”). It’s a feminine noun. Depending on context it can also mean tempering.

How do you pronounce cruachan in Irish?

Cruachan is said like “KROO-uh-khun” (IPA /ˈkɾˠuəxənˠ/).

Does cruachan have a plural?

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

Does cruachan have more than one meaning?

Yes. Cruachan can mean hardening or tempering, depending on context; the first is the most common.

Why does cruachan change to chruachan or gcruachan?

Irish changes the start of some words after certain words. After mo (my) cruachan becomes mo chruachan (lenition), and after ár (our) or i (in) it becomes ár gcruachan (eclipsis).

Is cruachan related to cruach, steel?

Yes, both come from the idea of hardness: cruach is steel, while cruachan is the verbal noun of cruaigh, to harden.

Learn Irish by
actually speaking it

Learn everyday Irish words like cruachan through guided conversation with Rua.

7-day free trial. Cancel anytime.

The HeyRua app home screen