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Radiation in Irish (Gathú): Meaning, Pronunciation, Usage

The Irish for radiation is gathú, a masculine noun. Ag gathú is radiating, from the verb gathaigh.
Updated October 2026Report a mistake

How to say “radiation” in Irish

Irish:
gathú
English:
radiation
Word type:
noun (verbal noun)
Verbal noun of:
gathaigh, to radiate (ag gathú, radiating)
Gender:
masculine
Pronunciation:
“GA-hoo”  /ˈɡahuː/
Various forms
Genitive singular:
gathaithe, an ghathaithe (e.g. leibhéal an ghathaithe, the level of radiation)

What does “gathú” mean?

radiation
The giving off of rays of energy such as light, heat or radioactive particles; the verbal noun of the verb gathaigh.Also: radiating, irradiation, emission of rays.

“Gathú” as a verbal noun

After ag, gathú means radiating: it is the verbal noun of the verb gathaigh (to radiate). A noun that follows it goes into the genitive.

agat
+
gathúverbal noun
=
ag gathúradiating

“Gathú” with the article

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

an gathú
the radiation
No change after an

“Gathú” in a sentence: Irish examples

Common Irish sentences using gathú, the Irish word for radiation.

Is féidir le gathú a bheith contúirteach.
Radiation can be dangerous.
Tomhaiseann an gléas seo an gathú.
This device measures the radiation.
Bhí leibhéal ard gathaithe sa cheantar.
There was a high level of radiation in the area.
Cosnaíonn an balla tiubh sinn ar an ngathú.
The thick wall protects us from the radiation.
Fuair sé cóireáil gathaithe san ospidéal.
He received radiation treatment in the hospital.
Tagann gathú ón ngrian gach lá.
Radiation comes from the sun every day.
Tá eolaithe ag déanamh staidéir ar ghathú teasa.
Scientists are studying heat radiation.

Other nouns in Irish

More everyday Irish nouns to learn next.

Radiation in Irish: frequently asked questions

What is the Irish for radiation?

The Irish for radiation is gathú (pronounced “GA-hoo”). It’s a masculine noun.

How do you pronounce gathú in Irish?

Gathú is said like “GA-hoo” (IPA /ˈɡahuː/).

Does gathú have a plural?

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

Why does gathú change to ghathú or ngathú?

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

What is the difference between gathú and radaíocht?

Both can mean radiation; radaíocht is common for radioactivity and radiation in general, while gathú stresses the act of sending out rays (ga, 'ray').

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