actiniwm

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