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cesiwm

caesium

NounMasculine (gwrywaidd)C2/ˈkɛsjʊm/

"cesiwm" means "caesium" in Welsh (masculine noun). Pronounced /ˈkɛsjʊm/. Mutation forms: Treiglad Meddal → gesiwm, Treiglad Trwynol → nghesiwm, Treiglad Llaes → chesiwm.

Mutation forms

In Welsh, the first letter of "cesiwm" changes depending on the grammatical context. These are the mutated forms:

MutationForm
Base formcesiwm
Treiglad Meddalgesiwm
Treiglad Trwynolnghesiwm
Treiglad Llaeschesiwm

Further reading

Welsh Mutations Explained — Soft, Nasal & Aspirate →Welsh Pronunciation — It's Actually Easier Than English →How to Learn Welsh as an Adult — A Step-by-Step Roadmap →Best Apps to Learn Welsh (2026) →Browse all Welsh vocabulary →

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