ymarweddiad

== Welsh == === Etymology === From ymarweddu +‎ -iad. === Noun === ymarweddiad m (uncountable) behaviour, conduct Synonym: ymddygiad === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “ymarweddiad”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies