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Monster in Irish (Ollphéist): Meaning, Pronunciation, Usage

‘ollphéist’ also means: huge worm

The Irish for monster is ollphéist, a feminine noun (plural ollphéisteanna).
Updated October 2026Report a mistake

How to say “monster” in Irish

Irish:
ollphéist
English:
monster, huge worm
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“UL-fayshch”  /ˈol̪ˠˌfʲeːʃtʲ/
Various forms
Plural:
ollphéisteanna (monsters)
Genitive singular:
ollphéiste, na hollphéiste (e.g. scéal na hollphéiste, the story of the monster)
Genitive plural:
ollphéisteanna, na n-ollphéisteanna (e.g. scéalta na n-ollphéisteanna, the stories of the monsters)

What does “ollphéist” mean?

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

monster
A huge, frightening creature, especially a serpent-like monster of Irish folklore living in a lake or the sea.Also: sea monster, serpent, dragon, lake monster.
1 other meaning: huge worm
2huge worm
A very large worm or reptile-like creature.Also: giant worm, reptile.

Other Irish words for monster: arracht (monster), béist (beast)

“Ollphéist” with the article

The plural of monster in Irish is ollphéisteanna. Here is ollphéist after the article (an t-alt), in the singular and the plural.

an ollphéist
the monster
No change: feminine nouns starting with a vowel keep their form after an
na hollphéisteanna
the monsters
Plural: na adds h before a vowel

“Ollphéist” in a sentence: Irish examples

Common Irish sentences using ollphéist, the Irish word for monster.

Deirtear go bhfuil ollphéist sa loch sin.
They say there is a monster in that lake.
Mharaigh an laoch an ollphéist le claíomh.
The hero killed the monster with a sword.
Bhí eagla ar na páistí roimh an ollphéist.
The children were afraid of the monster.
Chonaic sé ceann na hollphéiste os cionn an uisce.
He saw the monster's head above the water.
Tá go leor ollphéisteanna i seanscéalta na hÉireann.
There are many monsters in old Irish tales.
Tharraing m'iníon pictiúr d'ollphéist ghlas.
My daughter drew a picture of a green monster.
Ruaig Naomh Pádraig na hollphéisteanna as Éirinn, de réir an scéil.
Saint Patrick drove the monsters out of Ireland, according to the story.

Other nouns in Irish

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Monster in Irish: frequently asked questions

What is the Irish for monster?

The Irish for monster is ollphéist (pronounced “UL-fayshch”). It’s a feminine noun and the plural is ollphéisteanna. Depending on context it can also mean huge worm.

How do you pronounce ollphéist in Irish?

Ollphéist is said like “UL-fayshch” (IPA /ˈol̪ˠˌfʲeːʃtʲ/).

What is the plural of monster in Irish?

The plural of ollphéist is ollphéisteanna; with the article, na hollphéisteanna means “the monsters”. The genitive plural is ollphéisteanna, as in scéalta na n-ollphéisteanna (the stories of the monsters).

Does ollphéist have more than one meaning?

Yes. Ollphéist can mean monster or huge worm, depending on context; the first is the most common.

Why does ollphéist sometimes have a t or h in front of it?

Irish nouns beginning with a vowel take a prefix after certain words: an ollphéist (the monster), a hollphéist (her monster), a n-ollphéist (their monster), na hollphéisteanna (the monsters).

What is the difference between ollphéist and arracht?

Ollphéist is specifically a huge serpent-like monster, typical of Irish folklore, while arracht is a more general word for a monster or hideous creature.

Is oilliphéist the same word?

Yes, oilliphéist is an older or dialect spelling; the standard form is ollphéist, from oll 'great' and péist 'worm, beast'.

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