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Crustacean in Irish (Crústach): Meaning, Pronunciation, Usage

The Irish for crustacean is crústach, a masculine noun (plural crústaigh).
Updated October 2026Report a mistake

How to say “crustacean” in Irish

Irish:
crústach
English:
crustacean
Word type:
noun
Gender:
masculine
Pronunciation:
“KROOS-tukh”  /ˈkɾˠuːsˠt̪ˠəx/
Various forms
Plural:
crústaigh (crustaceans)
Genitive singular:
crústaigh, an chrústaigh (e.g. blaosc an chrústaigh, the shell of the crustacean)
Genitive plural:
crústach, na gcrústach (e.g. blaoscanna na gcrústach, the shells of the crustaceans)

What does “crústach” mean?

crustacean
An animal with a hard outer shell and jointed legs, such as a crab, lobster or shrimp.Also: shellfish, crab, lobster.

“Crústach” with the article

The plural of crustacean in Irish is crústaigh. Here is crústach after the article (an t-alt), in the singular and the plural.

an crústach
the crustacean
No change after an
na crústaigh
the crustaceans
Plural: no change after na

“Crústach” in a sentence: Irish examples

Common Irish sentences using crústach, the Irish word for crustacean.

Is crústach é an portán.
The crab is a crustacean.
Tá blaosc chrua ar an gcrústach.
The crustacean has a hard shell.
Is crústaigh iad na gliomaigh agus na ribí róibéis.
Lobsters and shrimps are crustaceans.
D'fhoghlaimíomar faoi chrústaigh sa rang eolaíochta.
We learned about crustaceans in science class.
Bíonn go leor crústaigh i measc na gcarraigeacha.
There are many crustaceans among the rocks.
Tá cosa an chrústaigh seo an-fhada.
This crustacean's legs are very long.
Tá ailléirge orm le crústaigh.
I'm allergic to crustaceans.

Other nouns in Irish

More everyday Irish nouns to learn next.

Crustacean in Irish: frequently asked questions

What is the Irish for crustacean?

The Irish for crustacean is crústach (pronounced “KROOS-tukh”). It’s a masculine noun and the plural is crústaigh.

How do you pronounce crústach in Irish?

Crústach is said like “KROOS-tukh” (IPA /ˈkɾˠuːsˠt̪ˠəx/).

What is the plural of crustacean in Irish?

The plural of crústach is crústaigh; with the article, na crústaigh means “the crustaceans”. The genitive plural is crústach, as in blaoscanna na gcrústach (the shells of the crustaceans).

Why does crústach change to chrústach or gcrústach?

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

Is 'crústach' the same as shellfish?

Not exactly: 'crústach' is a crustacean such as a crab or lobster, while 'sliogéisc' covers shellfish more generally, including molluscs.

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