tywodfaen

== Welsh == === Etymology === From tywod (“sand”) +‎ maen (“stone”). === Pronunciation === (North Wales) IPA(key): /təu̯ˈɔdvaɨ̯n/ (South Wales) IPA(key): /təu̯ˈɔdvai̯n/ === Noun === tywodfaen m (plural tywodfeini) sandstone ==== Derived terms ==== tywodfaen gwyrdd === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “tywodfaen”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies