HeyRua Get the app

Wavelength in Irish (Tonnfhad): Meaning, Pronunciation, Usage

The Irish for wavelength is tonnfhad, a masculine noun (plural tonnfhaid).
Updated October 2026Report a mistake

How to say “wavelength” in Irish

Irish:
tonnfhad
English:
wavelength
Word type:
noun
Gender:
masculine
Pronunciation:
“TUN-ad”  /ˈt̪ˠʊn̪ˠad̪ˠ/
Various forms
Plural:
tonnfhaid (wavelengths)
Genitive singular:
tonnfhaid, an tonnfhaid (e.g. luach an tonnfhaid, the value of the wavelength)
Genitive plural:
tonnfhad, na dtonnfhad (e.g. raon na dtonnfhad, the range of wavelengths)

What does “tonnfhad” mean?

wavelength
The distance between one peak of a wave and the next, used especially of light, sound and radio waves.Also: wave length, radio wavelength.

“Tonnfhad” with the article

The plural of wavelength in Irish is tonnfhaid. Here is tonnfhad after the article (an t-alt), in the singular and the plural.

an tonnfhad
the wavelength
No change after an
na tonnfhaid
the wavelengths
Plural: no change after na

“Tonnfhad” in a sentence: Irish examples

Common Irish sentences using tonnfhad, the Irish word for wavelength.

Tá tonnfhad gearr ag solas gorm.
Blue light has a short wavelength.
Tomhais an tonnfhad sa tsaotharlann inniu.
Measure the wavelength in the lab today.
Athraíonn dath an tsolais de réir an tonnfhaid.
The colour of light changes with the wavelength.
Craolann an stáisiún ar dhá thonnfhad éagsúla.
The station broadcasts on two different wavelengths.
Ní féidir linn na tonnfhaid sin a fheiceáil.
We can't see those wavelengths.
Cén tonnfhad atá ag an raidió seo?
What wavelength is this radio on?
Is ionann an luas agus an mhinicíocht faoi thonnfhad.
Speed equals frequency times wavelength.

Other nouns in Irish

More everyday Irish nouns to learn next.

Wavelength in Irish: frequently asked questions

What is the Irish for wavelength?

The Irish for wavelength is tonnfhad (pronounced “TUN-ad”). It’s a masculine noun and the plural is tonnfhaid.

How do you pronounce tonnfhad in Irish?

Tonnfhad is said like “TUN-ad” (IPA /ˈt̪ˠʊn̪ˠad̪ˠ/).

What is the plural of wavelength in Irish?

The plural of tonnfhad is tonnfhaid; with the article, na tonnfhaid means “the wavelengths”. The genitive plural is tonnfhad, as in raon na dtonnfhad (the range of wavelengths).

Why does tonnfhad change to thonnfhad or dtonnfhad?

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

Can 'tonnfhad' be used for being 'on the same wavelength' as someone?

That English idiom is not normally translated with 'tonnfhad'; Irish would say something like 'táimid ar aon intinn'. 'Tonnfhad' is mainly a technical term in physics and radio.

Learn Irish by
actually speaking it

Learn everyday Irish words like tonnfhad through guided conversation with Rua.

7-day free trial. Cancel anytime.

The HeyRua app home screen