cymalau'r Diafol

== Welsh == === Etymology === Literally, “the Devil's joints”. === Noun === cymalau'r Diafol common hemp-nettle (Galeopsis tetrahit) ==== Synonyms ==== y benboeth === Mutation === === Further reading === Cymdeithas Edward Llwyd (2018), “Y Bywiadur”, in Llên natur‎[1], retrieved 29 May 2025. R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “cymalaur diafol”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies