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Diagonal in Irish (fiarthrasna): Meaning, Forms, Examples

The Irish for diagonal is fiarthrasna: bóthar fiarthrasna, a diagonal road.
Updated October 2026Report a mistake

How to say “diagonal” in Irish

Irish:
fiarthrasna
English:
diagonal
Word type:
adjective
More diagonal:
níos fiarthrasna
Most diagonal:
is fiarthrasna
Pronunciation:
“FEER-hras-na”  /ˈfʲiəɾˌhɾˠasˠnˠə/

What does “fiarthrasna” mean?

diagonal
Running slantwise from one corner to another, across something at an angle.Also: oblique, slanting, crosswise, transverse.

“Fiarthrasna” after a noun

An Irish adjective comes after its noun. Here is fiarthrasna after bóthar (road, masculine), after sráid (street, feminine) and after a plural.

after a masculine nounbóthar fiarthrasnaa diagonal road
after a feminine nounsráid fhiarthrasnaa diagonal street
after a plural nounbóithre fiarthrasnadiagonal roads

séimhiú (the h) the ending

feminine
sráidstreet
+
fiarthrasnadiagonal
=
sráid fhiarthrasnaa diagonal street

After a feminine noun the adjective gets a séimhiú, an h after its first letter: sráid fhiarthrasna. After a masculine noun it stays as it is: bóthar fiarthrasna.

plural
bóithreroads
+
fiarthrasnadiagonal, plural
=
bóithre fiarthrasnadiagonal roads

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

More diagonal, most diagonal, very diagonal

níosmore
+
fiarthrasnadiagonal
=
níos fiarthrasnamore diagonal
ismost
+
fiarthrasnadiagonal
=
is fiarthrasnamost diagonal

Tá an líne seo níos fiarthrasna ná an ceann eile. This line is more diagonal than the other one.

more diagonalníos fiarthrasnain the past tense: ní b'fhiarthrasna
most diagonalis fiarthrasnain the past tense: ab fhiarthrasna
as diagonal aschomh fiarthrasna leno change after chomh
very diagonalan-fhiarthrasnaan- lenites, except d, t and s
too diagonalrófhiarthrasnaró- lenites

“Fiarthrasna” in a sentence: Irish examples

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

Tharraing sé stríoc fhiarthrasna ar an bpáipéar.
He drew a diagonal stripe on the paper.
Tá líne fhiarthrasna sa chearnóg.
There is a diagonal line in the square.
Bhí línte fiarthrasna ar an mbratach.
There were diagonal lines on the flag.
Tá an líne seo níos fiarthrasna ná an ceann eile.
This line is more diagonal than the other one.
Tá an cosán fiarthrasna trasna na páirce.
The path runs diagonally across the field.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Diagonal in Irish: frequently asked questions

What is the Irish for diagonal?

The Irish for diagonal is fiarthrasna (pronounced “FEER-hras-na”). It comes after the noun: bóthar fiarthrasna, a diagonal road; sráid fhiarthrasna, a diagonal street.

How do you say more diagonal and most diagonal in Irish?

níos fiarthrasna is more diagonal and is fiarthrasna is most diagonal. In the past tense they become ní b'fhiarthrasna and ab fhiarthrasna.

Why does fiarthrasna become fhiarthrasna?

After a feminine singular noun an adjective is lenited: it gets an h after its first letter. So sráid fhiarthrasna (a diagonal street) but bóthar fiarthrasna (a diagonal road), because bóthar is masculine.

How do you say very diagonal in Irish?

an-fhiarthrasna. Too diagonal is rófhiarthrasna, and as diagonal as is chomh fiarthrasna le.

How is fiarthrasna different from trasna?

Trasna means across, while fiarthrasna adds fiar, slanting, so it means diagonally across, as in líne fhiarthrasna, a diagonal line.

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