gwyach yddfgoch

== Welsh == === Alternative forms === gwyach wddfgoch === Etymology === gwyach (“grebe”) + gyddfgoch (“red-necked, red-throated”). === Noun === gwyach yddfgoch f (plural gwyachod gyddfgoch) red-necked grebe (Podiceps grisegena) === Mutation === === References ===