Reconstruction:Proto-Brythonic/-iβ̃

Etymology
From Insular Celtic *-īmā. Originally occurring in compounds *kreddīmā, *(ɸ)rodīmā, where the formation *dīmā, from Pre-Celtic *dʰeh₁meh₂, was resegmented as *-d-īmā. Supplanted and possibly  as the productive verbal noun formative for ī-verbs.