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Dydd Iau

Thursday

NounMasculine (gwrywaidd)A1

"Dydd Iau" means "Thursday" in Welsh (masculine noun). Mutation forms: Treiglad Meddal → ddydd Iau, Treiglad Trwynol → nydd Iau.

Mutation forms

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

MutationForm
Base formDydd Iau
Treiglad Meddalddydd Iau
Treiglad Trwynolnydd Iau

"Dydd Iau" in context

A dydd Iau byddaf yn agor cynllun canol y Rhyl Cyngor Sir Ddinbych.

And on Thursday I will be opening Denbighshire County Council's central Rhyl scheme.

B1

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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Related Welsh words

Dydd Llun

Monday

Dydd Mawrth

Tuesday

Dydd Mercher

Wednesday

Dydd Gwener

Friday

Dydd Sadwrn

Saturday

Dydd Sul

Sunday

wythnos

week

cloc

clock

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