tywodfryn

== Welsh == === Etymology === tywod (“sand”) +‎ bryn (“hillock”). === Noun === tywodfryn m (plural tywodfryniau) sandbank Synonyms: banc tywod, traethell sand dune === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “tywodfryn”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies