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Diphthong in Irish (Défhoghar): Meaning, Pronunciation, Usage

The Irish for diphthong is défhoghar, a masculine noun (plural défhoghair).
Updated October 2026Report a mistake

How to say “diphthong” in Irish

Irish:
défhoghar
English:
diphthong
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“DAY-oh-er”  /ˈdʲeːˌoːəɾ/
Various forms
Plural:
défhoghair (diphthongs)
Genitive singular:
défhoghair, an défhoghair (e.g. fuaim an défhoghair, the sound of the diphthong)
Genitive plural:
défhoghar, na ndéfhoghar (e.g. fuaimniú na ndéfhoghar, the pronunciation of diphthongs)

What does “défhoghar” mean?

diphthong
A vowel sound that glides from one vowel quality to another within a single syllable.Also: double vowel sound, gliding vowel.

“Défhoghar” with the article

The plural of diphthong in Irish is défhoghair. Here is défhoghar after the article (an t-alt), in the singular and the plural.

an défhoghar
the diphthong
No change after an
na défhoghair
the diphthongs
Plural: no change after na

“Défhoghar” in a sentence: Irish examples

Common Irish sentences using défhoghar, the Irish word for diphthong.

Is défhoghar í an fhuaim san fhocal sin.
The sound in that word is a diphthong.
Tá an défhoghar seo coitianta sa Ghaeilge.
This diphthong is common in Irish.
Mhínigh an múinteoir cad is défhoghar ann.
The teacher explained what a diphthong is.
Tá roinnt défhoghar i nGaeilge na Mumhan.
There are several diphthongs in Munster Irish.
Ní fhuaimníonn gach canúint na défhoghair mar an gcéanna.
Not every dialect pronounces the diphthongs the same way.
Bíonn fuaimniú an défhoghair deacair d'fhoghlaimeoirí.
Pronouncing the diphthong is hard for learners.
Scríobh na défhoghair ar an gclár bán.
Write the diphthongs on the whiteboard.

Other nouns in Irish

More everyday Irish nouns to learn next.

Diphthong in Irish: frequently asked questions

What is the Irish for diphthong?

The Irish for diphthong is défhoghar (pronounced “DAY-oh-er”). It’s a masculine noun and the plural is défhoghair.

How do you pronounce défhoghar in Irish?

Défhoghar is said like “DAY-oh-er” (IPA /ˈdʲeːˌoːəɾ/).

What is the plural of diphthong in Irish?

The plural of défhoghar is défhoghair; with the article, na défhoghair means “the diphthongs”. The genitive plural is défhoghar, as in fuaimniú na ndéfhoghar (the pronunciation of diphthongs).

Why does défhoghar change to dhéfhoghar or ndéfhoghar?

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

How is 'défhoghar' formed?

It combines the prefix dé- (two) with foghar (sound), the fh being silent, just as 'diphthong' comes from Greek for 'two sounds'.

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