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Welsh cylch
Breton kelc'h (cognate)
Proto-Brythonic *kɨrxl (inherited)
Latin circulus (borrowed)
Old Welsh circhl (inherited)
Middle Welsh kylch (inherited)

Welsh cylchu (affix)
Welsh cylched (affix)
Welsh cylchgrawn (affix)
Welsh amgylch (affix)
Welsh eurgylch (compound)
Welsh lleugylch (compound)
Welsh awyrgylch (compound)
Welsh cylchdro (compound)
Welsh cylchfan (affix)
Welsh cylchyn (affix)
Welsh cylchlythyr (affix)
Cumbric kelchyn (cognate)