Welsh Etymology From cau (“hollow, empty”) + ffon (“stick, lance”). Pronunciation (North Wales) IPA(key): /ˈkeɨ̯fɔn/ (South Wales) IPA(key): /ˈkei̯fɔn/ Noun ceuffon f (plural ceuffyn) a hollow cane (mechanics) piston Synonyms: piston, pillffon References R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “ceuffon”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic StudiesWikiwand - on Seamless Wikipedia browsing. On steroids.