effaith

== Welsh == === Etymology === Borrowed from Latin effectus (“effect”), as if via a Proto-Brythonic *efeiθ, but the word is not attested until the 16th century. === Pronunciation === (North Wales, standard, colloquial) IPA(key): /ˈɛfai̯θ/ (South Wales, colloquial) IPA(key): /ˈɛfɛθ/ (South Wales, standard) IPA(key): /ˈɛfai̯θ/ (South Wales, colloquial) IPA(key): /ˈɛfɛθ/ === Noun === effaith f (plural effeithiau) effect ==== Derived terms ==== effaith tŷ gwydr (“greenhouse effect”) effeithio (“to be effective; to affect”) effeithiol (“effective”) effeithlon (“efficient”) dieffaith (“ineffective”) === Mutation === === Further reading === D. G. Lewis, N. Lewis, editors (2005–present), “effaith”, in Gweiadur: the Welsh–English Dictionary, Gwerin R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “effaith”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies