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Reaction in Irish (Frithghníomhú): Meaning, Pronunciation, Usage

‘frithghníomhú’ also means: chemical reaction

The Irish for reaction is frithghníomhú, a masculine noun (plural frithghníomhuithe). Ag frithghníomhú is reacting, from the verb frithghníomhaigh.
Updated October 2026Report a mistake

How to say “reaction” in Irish

Irish:
frithghníomhú
English:
reaction, chemical reaction
Word type:
noun (verbal noun)
Verbal noun of:
frithghníomhaigh, to react (ag frithghníomhú, reacting)
Gender:
masculine
Pronunciation:
“FRIH-yee-voo”  /ˈfʲɾʲɪˌjiːvˠuː/
Various forms
Plural:
frithghníomhuithe (reactions)
Genitive singular:
frithghníomhaithe, an fhrithghníomhaithe (e.g. ráta an fhrithghníomhaithe, rate of the reaction)
Genitive plural:
frithghníomhuithe, na bhfrithghníomhuithe (e.g. torthaí na bhfrithghníomhuithe, the results of the reactions)

What does “frithghníomhú” mean?

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

reaction
The act of reacting or acting in response, the verbal noun of the verb frithghníomhaigh.Also: reacting, counteraction, response.
1 other meaning: chemical reaction
2chemical reaction
A process in which substances act on each other and change, as in chemistry.Also: reaction, reacting.

“Frithghníomhú” as a verbal noun

After ag, frithghníomhú means reacting: it is the verbal noun of the verb frithghníomhaigh (to react). A noun that follows it goes into the genitive.

agat
+
frithghníomhúverbal noun
=
ag frithghníomhúreacting

“Frithghníomhú” with the article

The plural of reaction in Irish is frithghníomhuithe. Here is frithghníomhú after the article (an t-alt), in the singular and the plural.

an frithghníomhú
the reaction
No change after an
na frithghníomhuithe
the reactions
Plural: no change after na

“Frithghníomhú” in a sentence: Irish examples

Common Irish sentences using frithghníomhú, the Irish word for reaction.

Bhí frithghníomhú láidir ón bpobal.
There was a strong reaction from the public.
Tharla an frithghníomhú go han-tapa.
The reaction happened very quickly.
Thomhais na daltaí ráta an fhrithghníomhaithe.
The pupils measured the rate of the reaction.
Déantar staidéar ar fhrithghníomhuithe ceimiceacha sa rang.
Chemical reactions are studied in class.
Ní raibh súil agam le frithghníomhú mar sin.
I didn't expect a reaction like that.
Scaoiltear teas i bhfrithghníomhú den sórt seo.
Heat is released in a reaction of this kind.
Bhí an teas ag méadú sa fhrithghníomhú.
The heat was increasing in the reaction.

Other nouns in Irish

More everyday Irish nouns to learn next.

Reaction in Irish: frequently asked questions

What is the Irish for reaction?

The Irish for reaction is frithghníomhú (pronounced “FRIH-yee-voo”). It’s a masculine noun and the plural is frithghníomhuithe. Depending on context it can also mean chemical reaction.

How do you pronounce frithghníomhú in Irish?

Frithghníomhú is said like “FRIH-yee-voo” (IPA /ˈfʲɾʲɪˌjiːvˠuː/).

What is the plural of reaction in Irish?

The plural of frithghníomhú is frithghníomhuithe; with the article, na frithghníomhuithe means “the reactions”. The genitive plural is frithghníomhuithe, as in torthaí na bhfrithghníomhuithe (the results of the reactions).

Does frithghníomhú have more than one meaning?

Yes. Frithghníomhú can mean reaction or chemical reaction, depending on context; the first is the most common.

Why does frithghníomhú change to fhrithghníomhú or bhfrithghníomhú?

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

What is the difference between frithghníomhú and imoibriú?

Both can translate 'reaction'; imoibriú is the usual term for a chemical reaction in modern science teaching, while frithghníomhú is used more for reacting or counteracting in general.

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