in English is:

moderator

Mutations

Soft:gymedrolydd
Nasal:nghymedrolydd
Aspirate:chymedrolydd

Use

y cymedrolydd hwn
fy nghymedrolydd i
dy gymedrolydd di
ei gymedrolydd ef/o
ei chymedrolydd hi
ein cymedrolydd ni
eich cymedrolydd chi
eu cymedrolydd nhw/hwy
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