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Tooth in Irish (Fiacail): Meaning, Pronunciation, Usage

‘fiacail’ also means: tooth of a tool · edge

The Irish for tooth is fiacail, a feminine noun (plural fiacla).
Updated October 2026Report a mistake

How to say “tooth” in Irish

Irish:
fiacail
English:
tooth, tooth of a tool, edge
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“FEE-uh-kil”  /ˈfʲiəkəlʲ/
Various forms
Plural:
fiacla (teeth)
Genitive singular:
fiacaile, na fiacaile (e.g. tinneas fiacaile, toothache)
Genitive plural:
fiacla, na bhfiacla (e.g. scuab fiacla, toothbrush)

What does “fiacail” mean?

“Fiacail” has three alternative meanings. The most common comes first.

tooth
One of the hard white parts in the mouth used for biting and chewing.Also: teeth, molar, fang.
2 other meanings: tooth of a tool or edge
2tooth of a tool
A pointed projection on a comb, saw, rake or gear wheel.Also: tooth, cog, prong, tine.
3edge
The edge or verge of something, as in a figurative sense of being on the brink.Also: verge, brink.

“Fiacail” with the article

The plural of tooth in Irish is fiacla. Here is fiacail after the article (an t-alt), in the singular and the plural.

an fhiacail
the tooth
Lenition: f becomes fh after an (feminine noun)
na fiacla
the teeth
Plural: no change after na

“Fiacail” in a sentence: Irish examples

Common Irish sentences using fiacail, the Irish word for tooth.

Tá tinneas fiacaile orm ó mhaidin.
I've had a toothache since this morning.
Thit fiacail amach as a béal inné.
A tooth fell out of her mouth yesterday.
Scuab do chuid fiacla roimh dhul a chodladh.
Brush your teeth before going to bed.
Tá an fhiacail sin lofa, caithfear í a bhaint.
That tooth is rotten, it will have to be pulled.
Tá fiacail scaoilte agam.
I have a loose tooth.
Chuaigh mé chuig an bhfiaclóir faoi m'fhiacail bhriste.
I went to the dentist about my broken tooth.
Bhí fiacla géara ag an madra.
The dog had sharp teeth.

Other nouns in Irish

More everyday Irish nouns to learn next.

Tooth in Irish: frequently asked questions

What is the Irish for tooth?

The Irish for tooth is fiacail (pronounced “FEE-uh-kil”). It’s a feminine noun and the plural is fiacla. Depending on context it can also mean tooth of a tool or edge.

How do you pronounce fiacail in Irish?

Fiacail is said like “FEE-uh-kil” (IPA /ˈfʲiəkəlʲ/).

What is the plural of tooth in Irish?

The plural of fiacail is fiacla; with the article, na fiacla means “the teeth”. The genitive plural is fiacla, as in scuab fiacla (toothbrush).

Does fiacail have more than one meaning?

Yes. Fiacail can mean tooth, tooth of a tool or edge, depending on context; the first is the most common.

Why does fiacail change to fhiacail or bhfiacail?

Irish changes the start of some words after certain words. After mo (my) fiacail becomes m'fhiacail (lenition), and after ár (our) or i (in) it becomes ár bhfiacail (eclipsis).

How do I say my mouth is watering in Irish?

Say "Tá uisce le m'fhiacla", literally 'there is water to my teeth'.

How do I say I have a toothache?

Use "Tá tinneas fiacaile orm" or "Tá déideadh orm".

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