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Subsoil in Irish (Fo-ithir): Meaning, Pronunciation, Usage

The Irish for subsoil is fo-ithir, a feminine noun (plural fo-ithreacha).
Updated October 2026Report a mistake

How to say “subsoil” in Irish

Irish:
fo-ithir
English:
subsoil
Word type:
noun
Gender:
feminine
Pronunciation:
“FUH-ih-hir”  /ˈfˠɔˌɪhɪɾʲ/
Various forms
Plural:
fo-ithreacha (subsoils)
Genitive singular:
fo-ithreach, na fo-ithreach (e.g. doimhneacht na fo-ithreach, depth of the subsoil)
Genitive plural:
fo-ithreacha, na bhfo-ithreacha (e.g. anailís na bhfo-ithreacha, the analysis of the subsoils)

What does “fo-ithir” mean?

subsoil
The layer of soil lying beneath the topsoil.Also: under-soil, lower soil layer.

“Fo-ithir” with the article

The plural of subsoil in Irish is fo-ithreacha. Here is fo-ithir after the article (an t-alt), in the singular and the plural.

an fho-ithir
the subsoil
Lenition: f becomes fh after an (feminine noun)
na fo-ithreacha
the subsoils
Plural: no change after na

“Fo-ithir” in a sentence: Irish examples

Common Irish sentences using fo-ithir, the Irish word for subsoil.

Tá an fho-ithir an-chrua san áit seo.
The subsoil is very hard here.
Is cré bhuí í an fho-ithir sa pháirc.
The subsoil in the field is yellow clay.
Bhain siad an ithir go dtí an fho-ithir.
They dug through the soil down to the subsoil.
Ní fhásann mórán i bhfo-ithir.
Not much grows in subsoil.
Rinneadh anailís ar an bhfo-ithir roimh an tógáil.
The subsoil was analysed before the building work.
Tá dath na fo-ithreach difriúil ón ithir.
The colour of the subsoil differs from the topsoil.
Bíonn fo-ithreacha éagsúla i ngach ceantar.
Every area has different subsoils.

Other nouns in Irish

More everyday Irish nouns to learn next.

Subsoil in Irish: frequently asked questions

What is the Irish for subsoil?

The Irish for subsoil is fo-ithir (pronounced “FUH-ih-hir”). It’s a feminine noun and the plural is fo-ithreacha.

How do you pronounce fo-ithir in Irish?

Fo-ithir is said like “FUH-ih-hir” (IPA /ˈfˠɔˌɪhɪɾʲ/).

What is the plural of subsoil in Irish?

The plural of fo-ithir is fo-ithreacha; with the article, na fo-ithreacha means “the subsoils”. The genitive plural is fo-ithreacha, as in anailís na bhfo-ithreacha (the analysis of the subsoils).

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

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

How does 'fo-ithir' relate to 'ithir'?

'Ithir' is soil or topsoil, and the prefix 'fo-' means under, so 'fo-ithir' is the subsoil beneath it.

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