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Floss in Irish (Flas): Meaning, Pronunciation, Usage

‘flas’ also means: dental floss

The Irish for floss is flas, a masculine noun.
Updated October 2026Report a mistake

How to say “floss” in Irish

Irish:
flas
English:
floss, dental floss
Word type:
noun
Gender:
masculine, third declension
Pronunciation:
“flass”  /fl̪ˠas̪/
Various forms
Genitive singular:
flasa, an fhlasa (e.g. píosa flasa, a piece of floss)

What does “flas” mean?

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

floss
Soft silky fibre, such as the fluffy material from silk cocoons or certain plants.Also: silk floss, fluff, down.
1 other meaning: dental floss
2dental floss
Thin thread used to clean between the teeth.Also: floss, tooth floss.

“Flas” with the article

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

an flas
the floss
No change after an

“Flas” in a sentence: Irish examples

Common Irish sentences using flas, the Irish word for floss.

Úsáideann sí flas gach oíche.
She uses floss every night.
Cheannaigh mé flas sa siopa poitigéara.
I bought floss in the chemist's.
Tá an flas sa seomra folctha.
The floss is in the bathroom.
Thug an fiaclóir bosca flasa dom.
The dentist gave me a box of floss.
Tá mo fhlas caite agam.
I have used up my floss.
Bhí flas bog ar an bplanda.
There was soft floss on the plant.
Cuir an flas i do mhála.
Put the floss in your bag.

Other nouns in Irish

More everyday Irish nouns to learn next.

Floss in Irish: frequently asked questions

What is the Irish for floss?

The Irish for floss is flas (pronounced “flass”). It’s a masculine noun. Depending on context it can also mean dental floss.

How do you pronounce flas in Irish?

Flas is said like “flass” (IPA /fl̪ˠas̪/).

Does flas have a plural?

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

Does flas have more than one meaning?

Yes. Flas can mean floss or dental floss, depending on context; the first is the most common.

Why does flas change to fhlas or bhflas?

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

Is 'flas' the same as 'blas' (taste)?

No. 'Flas' means floss, while 'blas' means taste or flavour; do not confuse them.

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