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Square in Irish (cearnach): Meaning, Forms, Examples

Other uses of ‘cearnach’: square (of measurement)

The Irish for square is cearnach: bosca cearnach, a square box.
Updated October 2026Report a mistake

How to say “square” in Irish

Irish:
cearnach
English:
square, square (of measurement)
Word type:
adjective
Squarer:
níos cearnaí
Squarest:
is cearnaí
Plural:
cearnacha
Pronunciation:
“KYAR-nukh”  /ˈcaɾˠn̪ˠəx/

What does “cearnach” mean?

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

square
Having four equal sides and four right angles, shaped like a square.Also: square-shaped, quadrangular.
1 other meaning: square (of measurement)
2square (of measurement)
Used in units of area, such as square metres.Also: square, squared.

Other Irish adjectives for square: cearnógach (square)

“Cearnach” after a noun

An Irish adjective comes after its noun. Here is cearnach after bosca (box, masculine), after fuinneog (window, feminine) and after a plural.

after a masculine nounbosca cearnacha square box
after a feminine nounfuinneog chearnacha square window
after a plural nounboscaí cearnachasquare boxes

séimhiú (the h) the ending

feminine
fuinneogwindow
+
cearnachsquare
=
fuinneog chearnacha square window

After a feminine noun the adjective gets a séimhiú, an h after its first letter: fuinneog chearnach. After a masculine noun it stays as it is: bosca cearnach.

plural
boscaíboxes
+
cearnachasquare, plural
=
boscaí cearnachasquare boxes

With a plural noun the adjective takes its plural form, cearnacha. It also gets an h after a plural that ends in a slender consonant; after other plurals it does not: fuinneoga cearnacha.

Squarer, squarest, very square

níosmore
+
cearnaísquare
=
níos cearnaísquarer
ismost
+
cearnaísquare
=
is cearnaísquarest

Tá an bord seo níos cearnaí ná an ceann eile. This table is squarer than the other one.

squarerníos cearnaíin the past tense: ní ba chearnaí
squarestis cearnaíin the past tense: ba chearnaí
as square aschomh cearnach leno change after chomh
very squarean-chearnachan- lenites, except d, t and s
too squareróchearnachró- lenites

“Cearnach” in a sentence: Irish examples

With a masculine noun, a feminine noun, a plural, a comparison and on its own.

Cheannaigh mé bosca cearnach sa siopa.
I bought a square box in the shop.
Tá fuinneog chearnach sa seomra.
There is a square window in the room.
Bhí na boscaí cearnacha go léir lán.
The square boxes were all full.
Tá an bord seo níos cearnaí ná an ceann eile.
This table is squarer than the other one.
Tá an pháirc cearnach.
The field is square.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Square in Irish: frequently asked questions

What is the Irish for square?

The Irish for square is cearnach (pronounced “KYAR-nukh”). It comes after the noun: bosca cearnach, a square box; fuinneog chearnach, a square window.

How do you say squarer and squarest in Irish?

níos cearnaí is squarer and is cearnaí is squarest. In the past tense they become ní ba chearnaí and ba chearnaí.

Why does cearnach become chearnach?

After a feminine singular noun an adjective is lenited: it gets an h after its first letter. So fuinneog chearnach (a square window) but bosca cearnach (a square box), because bosca is masculine.

What is the plural of cearnach?

With a plural noun cearnach becomes cearnacha: boscaí cearnacha, fuinneoga cearnacha.

How do you say very square in Irish?

an-chearnach. Too square is róchearnach, and as square as is chomh cearnach le.

Does cearnach have more than one meaning?

Yes. Cearnach can mean square or square (of measurement), depending on context; the first is the most common.

How do I say 'square root' in Irish?

A square root is 'fréamh chearnach', with 'cearnach' lenited after the feminine noun 'fréamh'.

What is the noun for a square?

The shape itself is 'cearnóg', while 'cearnach' is the adjective meaning square.

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