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Worm in Irish (Péist): Meaning, Pronunciation, Usage

‘péist’ also means: monster

The Irish for worm is péist, a feminine noun.
Updated October 2026Report a mistake

How to say “worm” in Irish

Irish:
péist
English:
worm, monster
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“paysht”  /pʲeːʃtʲ/
Various forms
Genitive singular:
péiste, na péiste (e.g. cac péiste, worm cast)

What does “péist” mean?

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

worm
A small, long, soft creature without legs that lives in soil or inside another animal.Also: earthworm, grub.
1 other meaning: monster
2monster
A large fabulous beast, such as a dragon or serpent, found in stories and legends.Also: dragon, serpent, beast, reptile.

Other Irish words for worm: cuiteog (earthworm)

“Péist” with the article

Here is péist after the article (an t-alt).

an phéist
the worm
Lenition: p becomes ph after an (feminine noun)

“Péist” in a sentence: Irish examples

Common Irish sentences using péist, the Irish word for worm.

Tá péist sa ghairdín.
There's a worm in the garden.
Chonaic mé an phéist ag dul faoin gcré.
I saw the worm going under the soil.
Chuir sé péist ar an duán.
He put a worm on the hook.
Bhí eireaball na péiste fós ag bogadh.
The worm's tail was still moving.
Deir an scéal go raibh péist sa loch.
The story says there was a monster in the lake.
Mharaigh an laoch an phéist mhór.
The hero killed the great serpent.
Is maith leis an lon dubh an phéist.
The blackbird likes the worm.

Other nouns in Irish

More everyday Irish nouns to learn next.

Worm in Irish: frequently asked questions

What is the Irish for worm?

The Irish for worm is péist (pronounced “paysht”). It’s a feminine noun. Depending on context it can also mean monster.

How do you pronounce péist in Irish?

Péist is said like “paysht” (IPA /pʲeːʃtʲ/).

Does péist have a plural?

No plural form is given for péist in the standard. Many abstract and mass nouns in Irish have no plural.

Does péist have more than one meaning?

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

Why does péist change to phéist or bpéist?

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

What is the difference between 'péist' and 'cruimh'?

'Péist' is the general word for a worm, also a mythical monster, while 'cruimh' usually means a maggot or grub.

Does 'péist' only mean a small worm?

No, in folklore 'péist' is also a lake monster or serpent, as in 'ollphéist', a huge monster.

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