cysefin

== Welsh == === Etymology === From a syncopated form of Proto-Celtic *kintusamīnos, from *kentus (“first”). === Adjective === cysefin (feminine singular cysefin, plural cysefin, not comparable) original, primal, primeval, native ==== Derived terms ==== rhif cysefin (“prime number”) ==== Related terms ==== cynt (“first”) cyntefin (“beginning of summer”) === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “cysefin”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies