defnyddol

== Welsh == === Etymology === defnydd (“material”) +‎ -ol. === Adjective === defnyddol (feminine singular defnyddol, plural defnyddol, equative mor ddefnyddol, comparative mwy defnyddol, superlative mwyaf defnyddol) alternative form of defnyddiol (“useful; material”) === Mutation === === References === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “defnyddol”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies