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Derivation in Irish (Díorthú): Meaning, Pronunciation, Usage

The Irish for derivation is díorthú, a masculine noun (plural díorthuithe). Ag díorthú is deriving, from the verb díorthaigh.
Updated October 2026Report a mistake

How to say “derivation” in Irish

Irish:
díorthú
English:
derivation
Word type:
noun (verbal noun)
Verbal noun of:
díorthaigh, to derive (ag díorthú, deriving)
Gender:
masculine
Pronunciation:
“DEER-hoo”  /ˈdʲiːɾˠhuː/
Various forms
Plural:
díorthuithe (derivations)
Genitive singular:
díorthaithe, an díorthaithe (e.g. rialacha an díorthaithe, the rules of derivation)
Genitive plural:
díorthuithe, na ndíorthuithe (e.g. rialacha na ndíorthuithe, the rules of the derivations)

What does “díorthú” mean?

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

derivation
The act of deriving one thing from another, especially forming a word from another word; verbal noun of the verb 'díorthaigh'.Also: deriving, derivative formation.
1 other meaning:
2derivation
In mathematics, the process of working out a formula or result step by step from other ones.Also: derivation of a formula.

“Díorthú” as a verbal noun

After ag, díorthú means deriving: it is the verbal noun of the verb díorthaigh (to derive). A noun that follows it goes into the genitive.

agat
+
díorthúverbal noun
=
ag díorthúderiving

“Díorthú” with the article

The plural of derivation in Irish is díorthuithe. Here is díorthú after the article (an t-alt), in the singular and the plural.

an díorthú
the derivation
No change after an
na díorthuithe
the derivations
Plural: no change after na

“Díorthú” in a sentence: Irish examples

Common Irish sentences using díorthú, the Irish word for derivation.

Is díorthú é sin ón Laidin.
That is a derivation from Latin.
Mhínigh an múinteoir an díorthú dúinn.
The teacher explained the derivation to us.
Tá próiseas an díorthaithe casta go leor.
The process of derivation is quite complicated.
Rinneamar staidéar ar dhíorthuithe sa rang inniu.
We studied derivations in class today.
Tá botún i mo dhíorthú, is dóigh liom.
There is a mistake in my derivation, I think.
Is iomaí focal a cruthaíodh trí dhíorthú.
Many words were created through derivation.
Taispeáin an díorthú iomlán ar an gclár.
Show the full derivation on the board.

Other nouns in Irish

More everyday Irish nouns to learn next.

Derivation in Irish: frequently asked questions

What is the Irish for derivation?

The Irish for derivation is díorthú (pronounced “DEER-hoo”). It’s a masculine noun and the plural is díorthuithe.

How do you pronounce díorthú in Irish?

Díorthú is said like “DEER-hoo” (IPA /ˈdʲiːɾˠhuː/).

What is the plural of derivation in Irish?

The plural of díorthú is díorthuithe; with the article, na díorthuithe means “the derivations”. The genitive plural is díorthuithe, as in rialacha na ndíorthuithe (the rules of the derivations).

Why does díorthú change to dhíorthú or ndíorthú?

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

How is 'díorthú' different from 'sanasaíocht'?

'Díorthú' is the process of forming one word from another, while 'sanasaíocht' is etymology, the study of word origins in general.

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