bys bach

== Welsh == === Etymology === Literally, “little finger”. === Noun === bys bach m (plural bysedd bach) (anatomy) little finger === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “bys bach”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies