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Caesium in Irish (Caeisiam): Meaning, Pronunciation, Usage

The Irish for caesium is caeisiam, a masculine noun.
Updated October 2026Report a mistake

How to say “caesium” in Irish

Irish:
caeisiam
English:
caesium
Word type:
noun
Gender:
masculine
Pronunciation:
“KAY-shee-um”  /ˈkeːʃiəmˠ/
Various forms
Genitive singular:
caeisiam, an chaeisiam (e.g. adamh caeisiam, a caesium atom)

What does “caeisiam” mean?

caesium
Caesium is a soft, silvery-gold metallic chemical element with the symbol Cs, used in atomic clocks.Also: cesium, Cs, chemical element.

“Caeisiam” with the article

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

an caeisiam
the caesium
No change after an

“Caeisiam” in a sentence: Irish examples

Common Irish sentences using caeisiam, the Irish word for caesium.

Is miotal bog é caeisiam.
Caesium is a soft metal.
Úsáidtear caeisiam i gcloig adamhacha.
Caesium is used in atomic clocks.
Is é Cs siombail an chaeisiam.
Cs is the symbol for caesium.
Imoibríonn caeisiam go foréigneach le huisce.
Caesium reacts violently with water.
Tá caeisiam sa chéad ghrúpa den tábla peiriadach.
Caesium is in the first group of the periodic table.
Fuarthas caeisiam radaighníomhach san ithir.
Radioactive caesium was found in the soil.
D'fhoghlaimíomar faoin gcaeisiam sa rang ceimice.
We learned about caesium in chemistry class.

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Caesium in Irish: frequently asked questions

What is the Irish for caesium?

The Irish for caesium is caeisiam (pronounced “KAY-shee-um”). It’s a masculine noun.

How do you pronounce caeisiam in Irish?

Caeisiam is said like “KAY-shee-um” (IPA /ˈkeːʃiəmˠ/).

Does caeisiam have a plural?

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

Why does caeisiam change to chaeisiam or gcaeisiam?

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

How do you say caesium-137 in Irish?

You say caeisiam-137, keeping the number after the word, as in English.

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