gwyach yddfddu

== Welsh == === Alternative forms === gwyach wddfddu === Etymology === gwyach (“grebe”) + gyddfddu (“black-necked, black-throated”). === Noun === gwyach yddfddu f (plural gwyachod gyddfddu) black-necked grebe (Podiceps nigricollis) Synonym: gwyach glustiog === Mutation === === References ===