gwinwydd du

== Welsh == === Etymology === Literally, “black grapevines”. === Noun === gwinwydd du (plural, singular gwinwydden ddu f) black bryony (Dioscorea communis, syn. Tamus communis) ==== Synonyms ==== cwlwm y coed === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “gwinwydden ddu”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies