trefolaeth

== Welsh == === Etymology === trefol (“relating to towns”) +‎ -aeth === Pronunciation === IPA(key): /trɛˈvɔlaɪθ/ === Noun === trefolaeth f (urban studies) urbanism (study of cities) === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “trefolaeth”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies