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From cyf- +‎ iaith (language) +‎ -u.


cyfieithu (first-person singular present cyfieithaf)

  1. (transitive) to translate
    Nei di gyfieithu'r tudalen 'ma?
    Could you translate this page?
  2. (transitive) to interpret


Derived terms[edit]

  • cyfieithydd m (translator; interpreter; grammarian; person of same language or race as another; fellow-countryman)

Related terms[edit]

  • cyfiaith (of the same language, speaking the same language; speaking the vernacular or native language; familiar, skilled, adjective)
  • cyfiaith f (language, tongue; common or known language, native tongue, vernacular; people speaking the same language, fellow-countrymen; nation, folk; one who speaks the same language, compatriot, fellow, partner; translation)


Welsh mutation
radical soft nasal aspirate
cyfieithu gyfieithu nghyfieithu chyfieithu
Note: Some of these forms may be hypothetical. Not every
possible mutated form of every word actually occurs.


  • cyfieithu”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies, 2014