brechiad

== Welsh == === Etymology === brechu (“to vaccinate”) +‎ -iad. === Noun === brechiad m (plural brechiadau) vaccination, inoculation Synonym: pigiad === Mutation === === Further reading === Griffiths, Bruce; Glyn Jones, Dafydd (1995), “inoculation”, in Geiriadur yr Academi: The Welsh Academy English–Welsh Dictionary‎[1], Cardiff: University of Wales Press, →ISBN Griffiths, Bruce; Glyn Jones, Dafydd (1995), “vaccination”, in Geiriadur yr Academi: The Welsh Academy English–Welsh Dictionary‎[2], Cardiff: University of Wales Press, →ISBN D. G. Lewis, N. Lewis, editors (2005–present), “brechiad”, in Gweiadur: the Welsh–English Dictionary, Gwerin R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “brechiad”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies