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Bacterium in Irish (Baictéar): Meaning, Pronunciation, Usage

The Irish for bacterium is baictéar, a masculine noun (plural baictéir).
Updated October 2026Report a mistake

How to say “bacterium” in Irish

Irish:
baictéar
English:
bacterium
Word type:
noun
Gender:
masculine
Pronunciation:
“BAK-tyayr”  /ˈbakʲtʲeːɾˠ/
Various forms
Plural:
baictéir (bacteria)
Genitive singular:
baictéir, an bhaictéir (e.g. cineál an bhaictéir, the type of the bacterium)
Genitive plural:
baictéar, na mbaictéar (e.g. fás na mbaictéar, the growth of the bacteria)

What does “baictéar” mean?

bacterium
A tiny single-celled organism, some kinds of which cause disease.Also: bacteria, germ, microbe.

“Baictéar” with the article

The plural of bacterium in Irish is baictéir. Here is baictéar after the article (an t-alt), in the singular and the plural.

an baictéar
the bacterium
No change after an
na baictéir
the bacteria
Plural: no change after na

“Baictéar” in a sentence: Irish examples

Common Irish sentences using baictéar, the Irish word for bacterium.

Is orgánach beag bídeach é baictéar.
A bacterium is a tiny organism.
Tá baictéir i ngach áit timpeall orainn.
There are bacteria everywhere around us.
Maraíonn an t-antaibheathach na baictéir.
The antibiotic kills the bacteria.
Ní féidir baictéir a fheiceáil gan micreascóp.
You can't see bacteria without a microscope.
Scaipeann baictéir go tapa ar lámha salacha.
Bacteria spread quickly on dirty hands.
Rinne an dochtúir tástáil ar líon na mbaictéar.
The doctor tested the number of bacteria.
Bíonn baictéir mhaithe sa ghoile freisin.
There are good bacteria in the stomach too.

Other nouns in Irish

More everyday Irish nouns to learn next.

Bacterium in Irish: frequently asked questions

What is the Irish for bacterium?

The Irish for bacterium is baictéar (pronounced “BAK-tyayr”). It’s a masculine noun and the plural is baictéir.

How do you pronounce baictéar in Irish?

Baictéar is said like “BAK-tyayr” (IPA /ˈbakʲtʲeːɾˠ/).

What is the plural of bacterium in Irish?

The plural of baictéar is baictéir; with the article, na baictéir means “the bacteria”. The genitive plural is baictéar, as in fás na mbaictéar (the growth of the bacteria).

Why does baictéar change to bhaictéar or mbaictéar?

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

What is the difference between baictéar and víreas?

Baictéar is a bacterium, a living cell, while víreas is a virus. Antibiotics (antaibheathaigh) work against baictéir but not against víris.

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