in English is:

primogeniture

Mutations

Soft:gyntaf-anedigaeth
Nasal:nghyntaf-anedigaeth
Aspirate:chyntaf-anedigaeth

Use

y gyntaf-anedigaeth hon
fy nghyntaf-anedigaeth i
dy gyntaf-anedigaeth di
ei gyntaf-anedigaeth ef/o
ei chyntaf-anedigaeth hi
ein cyntaf-anedigaeth ni
eich cyntaf-anedigaeth chi
eu cyntaf-anedigaeth nhw/hwy
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