protactiniwm

== Welsh == === Etymology === Borrowed from English protactinium. === Pronunciation === IPA(key): /ˌprɔtakˈtɪnjʊm/ Rhymes: -ɪnjʊm === Noun === protactiniwm m (uncountable) protactinium === Mutation === === References === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “protactiniwm”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies