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Subset in Irish (Fo-thacar): Meaning, Pronunciation, Usage

The Irish for subset is fo-thacar, a masculine noun (plural fo-thacair).
Updated October 2026Report a mistake

How to say “subset” in Irish

Irish:
fo-thacar
English:
subset
Word type:
noun
Gender:
masculine
Pronunciation:
“FUH-hak-ur”  /ˈfˠɔˌhakəɾˠ/
Various forms
Plural:
fo-thacair (subsets)
Genitive singular:
fo-thacair, an fho-thacair (e.g. eilimintí an fho-thacair, elements of the subset)
Genitive plural:
fo-thacar, na bhfo-thacar (e.g. líon na bhfo-thacar, the number of subsets)

What does “fo-thacar” mean?

subset
In mathematics, a set whose members all belong to another, larger set.Also: sub-set, set inclusion.

“Fo-thacar” with the article

The plural of subset in Irish is fo-thacair. Here is fo-thacar after the article (an t-alt), in the singular and the plural.

an fo-thacar
the subset
No change after an
na fo-thacair
the subsets
Plural: no change after na

“Fo-thacar” in a sentence: Irish examples

Common Irish sentences using fo-thacar, the Irish word for subset.

Is fo-thacar de A é B.
B is a subset of A.
Scríobh síos gach fo-thacar den tacar seo.
Write down every subset of this set.
Tá trí eilimint san fho-thacar sin.
There are three elements in that subset.
Cé mhéad fo-thacar atá ag tacar le dhá eilimint?
How many subsets does a set with two elements have?
Tá an tacar folamh ina fho-thacar de gach tacar.
The empty set is a subset of every set.
Tarraing léaráid Venn den fho-thacar.
Draw a Venn diagram of the subset.
Tá ceithre fho-thacar ag an tacar sin.
That set has four subsets.

Other nouns in Irish

More everyday Irish nouns to learn next.

Subset in Irish: frequently asked questions

What is the Irish for subset?

The Irish for subset is fo-thacar (pronounced “FUH-hak-ur”). It’s a masculine noun and the plural is fo-thacair.

How do you pronounce fo-thacar in Irish?

Fo-thacar is said like “FUH-hak-ur” (IPA /ˈfˠɔˌhakəɾˠ/).

What is the plural of subset in Irish?

The plural of fo-thacar is fo-thacair; with the article, na fo-thacair means “the subsets”. The genitive plural is fo-thacar, as in líon na bhfo-thacar (the number of subsets).

Why does fo-thacar change to fho-thacar or bhfo-thacar?

Irish changes the start of some words after certain words. After mo (my) fo-thacar becomes m'fho-thacar (lenition), and after ár (our) or i (in) it becomes ár bhfo-thacar (eclipsis).

How does 'fo-thacar' relate to 'tacar'?

'Tacar' means a set in mathematics, and the prefix 'fo-' (sub-) gives 'fo-thacar', a subset.

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