traethell

== Welsh == === Etymology === From traeth +‎ -ell. === Noun === traethell f (plural traethellau or traethelli) sandbank, sandbar, strand === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “traethell”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies