heol ddeuol

== Welsh == === Noun === heol ddeuol f (plural heolydd deuol, not mutable) dual carriageway, divided highway Synonyms: heol ddwbl, ffordd ddeuol === References === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “heol ddeuol”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies