in English is:

fretwork

,

tracery

Mutations

Soft:rwyllwaith
Nasal:(no mutation)
Aspirate:(no mutation)

Use

y rhwyllwaith hwn
fy rhwyllwaith i
dy rwyllwaith di
ei rwyllwaith ef/o
ei rhwyllwaith hi
ein rhwyllwaith ni
eich rhwyllwaith chi
eu rhwyllwaith nhw/hwy
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