Reconstruction:Proto-Brythonic/-oβ̃

Etymology
From earlier *-omā, from the thematic present vowel + *-mā as abstracted from *-dīmā. See.

Descendants
*-omā was secondarily lengthened to *-ʉ̄mā in West Brythonic, based on the long vowels of *-īma, *-āmā.
 * West Brythonic: *-üβ̃