in English is:

heartwood

,

mettle

,

spirit[1]

Mutations

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

Use

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