in English is:

a certain day

Mutations

Soft:ddyddgwaith
Nasal:nyddgwaith
Aspirate:(no mutation)

Use

y dyddgwaith hwn
fy nyddgwaith i
dy ddyddgwaith di
ei ddyddgwaith ef/o
ei dyddgwaith hi
ein dyddgwaith ni
eich dyddgwaith chi
eu dyddgwaith nhw/hwy
External

Dictionary Portal

This is a library of dictionaries and other online resources where you can search further for dyddgwaith*:

Specialist Dictionaries
Glossaries
Terminology
Encyclopedia
Example Sentences
Sentences containing:

*External websites will be opened in a new window.