Celcyniaeth, n. dissimulation
Celdy, n. arbour
Celedig, a. hidden, concealed
Celedigaeth, n. concealment
Celfan, n. place of retreat
Celf, n. art, craft, mystery
Celfi, n. instruments, tools
Celfydd, a. skilful, artful
Celfyddgar, a. scientific
Celfyddus, a. technical