cyf-

• cy-, cyn-

From Middle Welsh kyu-, from Old Welsh com-, from Proto-Brythonic *köβ̃-, from Proto-Celtic *kom-.^[1] Cognate with Cornish kev-.

• IPA^(key): /kəv/

cyf-

1. together, co-, con-

   Synonyms: cy-, cyd-, cyn-, cyt-

   ‎cyf- + ‎un (“one”) → ‎cyfun (“concordant, united”)

   ‎cyf- + ‎amod (“condition”) → ‎cyfamod (“covenant”)

   ‎cyf- + ‎enw (“name”) → ‎cyfenw (“surname”)

2. equal, similar, equi-

   ‎cyf- + ‎lliw (“colour”) → ‎cyfliw (“of the same colour”)

   ‎cyf- + ‎oed (“age, time”) → ‎cyfoed (“contemporary, of the same age, at the same time”)

   ‎cyf- + ‎uwch (“higher”) → ‎cyfuwch (“as high”)

3. affirmative prefix, emphasises prefixed word

   ‎cyf- + ‎llym (“sharp, keen”) → ‎cyflym (“quick, fast”)

   ‎cyf- + ‎agos (“near”) → ‎cyfagos (“neighbouring, adjacent”)

   ‎cyf- + ‎llawn (“full”) → ‎cyflawn (“complete, total”)

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