twm cap du

== Welsh == === Etymology === Literally, “black cap tom”. === Noun === twm cap du m (plural tymiau cap du) Eurasian blackcap (Sylvia atricapilla) ==== Synonyms ==== telor penddu cap du === Mutation === === Further reading === Cymdeithas Edward Llwyd (2018), “Y Bywiadur”, in Llên natur‎[1], retrieved 6 September 2025.