in English is:

sanitation

Mutations

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

Use

yr iechydaeth hon
fy iechydaeth i
dy iechydaeth di
ei iechydaeth ef/o
ei hiechydaeth hi
ein hiechydaeth ni
eich iechydaeth chi
eu hiechydaeth nhw/hwy
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