in English is:

condominium

,

joint rule

Mutations

Soft:gyd-deyrnasiaeth
Nasal:nghyd-deyrnasiaeth
Aspirate:chyd-deyrnasiaeth

Use

y cyd-deyrnasiaeth hwn
fy nghyd-deyrnasiaeth i
dy gyd-deyrnasiaeth di
ei gyd-deyrnasiaeth ef/o
ei chyd-deyrnasiaeth hi
ein cyd-deyrnasiaeth ni
eich cyd-deyrnasiaeth chi
eu cyd-deyrnasiaeth nhw/hwy
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