isfyd

== Welsh == === Etymology === From is- (“under, lower”) +‎ byd (“world”). === Pronunciation === (North Wales) IPA(key): /ˈiːsˌvɨːd/ (South Wales) IPA(key): /ˈiːsˌviːd/ === Noun === isfyd m (plural isfydoedd) (mythology) underworld, netherworld Synonyms: annwfn, annwn (rare) underworld (criminal society) === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “isfyd”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies