in English is:

salinity

Mutations

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

Use

yr halwynedd hwn
fy halwynedd i
dy halwynedd di
ei halwynedd ef/o
ei halwynedd hi
ein halwynedd ni
eich halwynedd chi
eu halwynedd nhw/hwy
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