in English is:

chairperson

Mutations

Soft:gadeiryddes
Nasal:nghadeiryddes
Aspirate:chadeiryddes

Use

y gadeiryddes hon
fy nghadeiryddes i
dy gadeiryddes di
ei gadeiryddes ef/o
ei chadeiryddes hi
ein cadeiryddes ni
eich cadeiryddes chi
eu cadeiryddes nhw/hwy
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