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Dolphin in Irish (Deilf): Meaning, Pronunciation, Usage

The Irish for dolphin is deilf, a feminine noun (plural deilfeanna).
Updated October 2026Report a mistake

How to say “dolphin” in Irish

Irish:
deilf
English:
dolphin
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“delf”  /dʲɛlʲfʲ/
Various forms
Plural:
deilfeanna (dolphins)
Genitive singular:
deilfe, na deilfe (e.g. eite na deilfe, the dolphin's fin)
Genitive plural:
deilfeanna, na ndeilfeanna (e.g. scoil na ndeilfeanna, the school of dolphins)

What does “deilf” mean?

dolphin
A dolphin: an intelligent sea mammal with a beak-like snout that lives in groups and swims fast.Also: porpoise, sea mammal.

“Deilf” with the article

The plural of dolphin in Irish is deilfeanna. Here is deilf after the article (an t-alt), in the singular and the plural.

an deilf
the dolphin
No change: d and t are not lenited after an
na deilfeanna
the dolphins
Plural: no change after na

“Deilf” in a sentence: Irish examples

Common Irish sentences using deilf, the Irish word for dolphin.

Chonaic mé deilf sa chuan inné.
I saw a dolphin in the harbour yesterday.
Tá an deilf ag léim as an uisce.
The dolphin is jumping out of the water.
Bhí na deilfeanna ag snámh in aice an bháid.
The dolphins were swimming beside the boat.
Is ainmhí an-chliste í an deilf.
The dolphin is a very clever animal.
Chualamar fuaim na deilfe faoin uisce.
We heard the dolphin's sound underwater.
Tá cáil ar Fungie, deilf an Daingin.
Fungie, the Dingle dolphin, is famous.
Is aoibhinn le mo mhac deilfeanna.
My son loves dolphins.

Other nouns in Irish

More everyday Irish nouns to learn next.

Dolphin in Irish: frequently asked questions

What is the Irish for dolphin?

The Irish for dolphin is deilf (pronounced “delf”). It’s a feminine noun and the plural is deilfeanna.

How do you pronounce deilf in Irish?

Deilf is said like “delf” (IPA /dʲɛlʲfʲ/).

What is the plural of dolphin in Irish?

The plural of deilf is deilfeanna; with the article, na deilfeanna means “the dolphins”. The genitive plural is deilfeanna, as in scoil na ndeilfeanna (the school of dolphins).

Why does deilf change to dheilf or ndeilf?

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

Is a dolphin a fish in Irish?

No, a deilf is a mammal, a 'míol mór' type creature, not an 'iasc', though it lives in the sea. A porpoise is usually 'muc mhara'.

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