-edd

• (North Wales, standard, colloquial) IPA^(key): /ɛð/
  • (North Wales, colloquial) IPA^(key): /að/
• (South Wales) IPA^(key): /ɛð/

From Middle Welsh -eð, from Proto-Brythonic *-eð (whence also Cornish -edh), from Proto-Celtic *-iyā (whence also Old Irish -e), from Proto-Indo-European *-i-eh₂. Cognate with Ancient Greek -ίᾱ (-íā) and Latin -ia.

-edd m (plural -eddau)

1. forming abstract nouns, -ness, -ment

   ‎anabl (“unable, disabled”) + ‎-edd → ‎anabledd (“disability”)

   ‎mawr (“big, great”) + ‎-edd → ‎mawredd (“greatness”)

   ‎cymesur (“symmetrical”) + ‎-edd → ‎cymesuredd (“symmetry”)

   ‎amgylch (“surroundings”) + ‎-edd → ‎amgylchedd (“environment”)

From Proto-Celtic *-iyās, nominative plural of *ī-stem feminine nouns like *rīganī (“queen”) (whence Welsh rhiain (“maiden”), plural rhianedd),^[1] from Proto-Indo-European *-ih₂es, nominative plural to nouns in *-ih₂.

-edd

1. forming plural nouns, -s

   Synonyms: -aid, -aint, -au, -ed, -en, -i, -iadau, -iaid, -iau, -ion, -od, -oedd, -on, -ydd, -yr, -ys

   ‎gwraig (“woman, wife”) + ‎-edd → ‎gwragedd (“women, wives”)

   ‎rhiain (“maiden”) + ‎-edd → ‎rhianedd (“maidens”)

   ‎teyrn (“monarch, kind”) + ‎-edd → ‎teyrnedd (“monarchs, kings”)

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