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Airtight in Irish (aerdhíonach): Meaning, Forms, Examples

The Irish for airtight is aerdhíonach: bosca aerdhíonach, an airtight box.
Updated October 2026Report a mistake

How to say “airtight” in Irish

Irish:
aerdhíonach
English:
airtight
Word type:
adjective
More airtight:
níos aerdhíonaí
Most airtight:
is aerdhíonaí
Plural:
aerdhíonacha
Pronunciation:
“AIR-yee-un-ukh”  /ˈeːɾˌʝiːnˠəx/

What does “aerdhíonach” mean?

airtight
Sealed so that no air can get in or out.Also: hermetic, sealed, air-proof.

“Aerdhíonach” after a noun

An Irish adjective comes after its noun. Here is aerdhíonach after bosca (box, masculine), after bean (woman, feminine) and after a plural.

after a masculine nounbosca aerdhíonachan airtight box
after a feminine nounbean aerdhíonachan airtight woman
after a plural nounboscaí aerdhíonachaairtight boxes

séimhiú (the h) the ending

plural
boscaíboxes
+
aerdhíonachaairtight, plural
=
boscaí aerdhíonachaairtight boxes

With a plural noun the adjective takes its plural form, aerdhíonacha.

More airtight, most airtight, very airtight

níosmore
+
aerdhíonaíairtight
=
níos aerdhíonaímore airtight
ismost
+
aerdhíonaíairtight
=
is aerdhíonaímost airtight

Tá an claibín seo níos aerdhíonaí ná an ceann eile. This lid is more airtight than the other one.

more airtightníos aerdhíonaíin the past tense: ní b'aerdhíonaí
most airtightis aerdhíonaíin the past tense: ab aerdhíonaí
as airtight aschomh haerdhíonach lechomh puts an h before a vowel
very airtightan-aerdhíonachan- lenites, except d, t and s
too airtightró-aerdhíonachró- lenites

“Aerdhíonach” in a sentence: Irish examples

With a masculine noun, a feminine noun, a plural, a comparison and on its own.

Cuir an bia i mbosca aerdhíonach.
Put the food in an airtight box.
Tá an caife i gcrúsca aerdhíonach.
The coffee is in an airtight jar.
Coinnigh na brioscaí i soithí aerdhíonacha.
Keep the biscuits in airtight containers.
Tá an claibín seo níos aerdhíonaí ná an ceann eile.
This lid is more airtight than the other one.
Níl an doras aerdhíonach fós.
The door is not airtight yet.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Airtight in Irish: frequently asked questions

What is the Irish for airtight?

The Irish for airtight is aerdhíonach (pronounced “AIR-yee-un-ukh”). It comes after the noun: bosca aerdhíonach, an airtight box; bean aerdhíonach, an airtight woman.

How do you say more airtight and most airtight in Irish?

níos aerdhíonaí is more airtight and is aerdhíonaí is most airtight. In the past tense they become ní b'aerdhíonaí and ab aerdhíonaí.

What is the plural of aerdhíonach?

With a plural noun aerdhíonach becomes aerdhíonacha: boscaí aerdhíonacha, mná aerdhíonacha.

How do you say very airtight in Irish?

an-aerdhíonach. Too airtight is ró-aerdhíonach, and as airtight as is chomh haerdhíonach le.

Is there a similar word for waterproof?

Yes, 'uiscedhíonach' means waterproof, built the same way from 'uisce' and 'díonach', just as 'aerdhíonach' comes from 'aer' and 'díonach'.

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