-iol

• -ol

From Middle Welsh -awl, from Proto-Brythonic *-ọl, from Proto-Celtic *-ālos, reinforced by Latin -ālis.

• IPA^(key): /jɔl/

-iol

1. adjectival suffix

   ‎budd (“benefit”) + ‎-iol → ‎buddiol (“beneficial”)

   ‎dinistr (“destruction”) + ‎-iol → ‎dinistriol (“destructive”)

   ‎bygwth (“to threaten”) + ‎-iol → ‎bygythiol (“threatening”)

   ‎gwraidd (“root”) + ‎-iol → ‎gwreiddiol (“original”)

R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “-iol”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies