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Heavy water in Irish (Tromuisce): Meaning, Pronunciation, Usage

The Irish for heavy water is tromuisce, a masculine noun.
Updated October 2026Report a mistake

How to say “heavy water” in Irish

Irish:
tromuisce
English:
heavy water
Word type:
noun
Gender:
masculine, fourth declension
Pronunciation:
“TRUM-ish-kyuh”  /ˈt̪ˠɾˠʊmˌɪʃcə/
Various forms
Genitive singular:
tromuisce, an tromuisce (e.g. táirgeadh tromuisce, production of heavy water)

What does “tromuisce” mean?

heavy water
Water in which the ordinary hydrogen is replaced by deuterium, used in some nuclear reactors.Also: deuterium oxide.

“Tromuisce” with the article

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

an tromuisce
the heavy water
No change after an

“Tromuisce” in a sentence: Irish examples

Common Irish sentences using tromuisce, the Irish word for heavy water.

Is cineál speisialta uisce é tromuisce.
Heavy water is a special kind of water.
Úsáidtear an tromuisce i roinnt imoibreoirí núicléacha.
Heavy water is used in some nuclear reactors.
Tá an tromuisce níos troime ná gnáthuisce.
Heavy water is heavier than ordinary water.
Bhí monarcha tromuisce san Iorua le linn an chogaidh.
There was a heavy water plant in Norway during the war.
Tá deoitéiriam sa tromuisce in ionad hidrigine.
Heavy water contains deuterium instead of hydrogen.
Rinne na heolaithe staidéar ar airíonna an tromuisce.
The scientists studied the properties of heavy water.
Ní féidir tromuisce a aithint ó uisce le do shúil.
You cannot tell heavy water from water by eye.

Other nouns in Irish

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Heavy water in Irish: frequently asked questions

What is the Irish for heavy water?

The Irish for heavy water is tromuisce (pronounced “TRUM-ish-kyuh”). It’s a masculine noun.

How do you pronounce tromuisce in Irish?

Tromuisce is said like “TRUM-ish-kyuh” (IPA /ˈt̪ˠɾˠʊmˌɪʃcə/).

Does tromuisce have a plural?

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

Why does tromuisce change to thromuisce or dtromuisce?

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

How is 'tromuisce' formed?

It is a compound of 'trom' (heavy) and 'uisce' (water), a direct calque of the English term 'heavy water'.

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