HeyRua Get the app

By-product in Irish (Fotháirge): Meaning, Pronunciation, Usage

The Irish for by-product is fotháirge, a masculine noun (plural fotháirgí).
Updated October 2026Report a mistake

How to say “by-product” in Irish

Irish:
fotháirge
English:
by-product
Word type:
noun
Gender:
masculine, fourth declension
Pronunciation:
“FOH-haw-rig-uh”  /ˈfˠɔhɑːɾʲəɟə/
Various forms
Plural:
fotháirgí (by-products)
Genitive singular:
fotháirge, an fhotháirge (e.g. luach an fhotháirge, the value of the by-product)
Genitive plural:
fotháirgí, na bhfotháirgí (e.g. díol na bhfotháirgí, the sale of the by-products)

What does “fotháirge” mean?

by-product
A secondary product made incidentally while making something else.Also: byproduct, side product, secondary product.

“Fotháirge” with the article

The plural of by-product in Irish is fotháirgí. Here is fotháirge after the article (an t-alt), in the singular and the plural.

an fotháirge
the by-product
No change after an
na fotháirgí
the by-products
Plural: no change after na

“Fotháirge” in a sentence: Irish examples

Common Irish sentences using fotháirge, the Irish word for by-product.

Is fotháirge den phróiseas é an gás seo.
This gas is a by-product of the process.
Díoltar an fotháirge le feirmeoirí.
The by-product is sold to farmers.
Tá margadh maith ann do na fotháirgí.
There is a good market for the by-products.
Úsáidtear fotháirgí na déiríochta i mbia ainmhithe.
Dairy by-products are used in animal feed.
Bhí boladh láidir ón bhfotháirge.
The by-product had a strong smell.
Rinneamar staidéar ar luach an fhotháirge.
We studied the value of the by-product.
Is fotháirge den ola é an tarra.
Tar is a by-product of oil.

Other nouns in Irish

More everyday Irish nouns to learn next.

By-product in Irish: frequently asked questions

What is the Irish for by-product?

The Irish for by-product is fotháirge (pronounced “FOH-haw-rig-uh”). It’s a masculine noun and the plural is fotháirgí.

How do you pronounce fotháirge in Irish?

Fotháirge is said like “FOH-haw-rig-uh” (IPA /ˈfˠɔhɑːɾʲəɟə/).

What is the plural of by-product in Irish?

The plural of fotháirge is fotháirgí; with the article, na fotháirgí means “the by-products”. The genitive plural is fotháirgí, as in díol na bhfotháirgí (the sale of the by-products).

Why does fotháirge change to fhotháirge or bhfotháirge?

Irish changes the start of some words after certain words. After mo (my) fotháirge becomes m'fhotháirge (lenition), and after ár (our) or i (in) it becomes ár bhfotháirge (eclipsis).

How is 'fotháirge' formed?

It is 'táirge' (product) with the prefix 'fo-' meaning secondary or sub-, so 'fotháirge' is a secondary product, a by-product.

Learn Irish by
actually speaking it

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

7-day free trial. Cancel anytime.

The HeyRua app home screen