trawsnewidydd

== Welsh == === Etymology === From trawsnewid +‎ -ydd. === Noun === trawsnewidydd m (plural trawsnewidyddion) converter, transformer (person or thing causing conversion or transformation) trawsnewidydd catalytig ― catalytic converter === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “trawsnewidydd”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies