hwylbren y llyw

== Welsh == === Noun === hwylbren y llyw m or f (plural hwylbrennau'r llyw, not mutable) (nautical) mizzenmast ==== Synonyms ==== hwylbren ôl === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “hwylbren y llyw”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies