gwrthdoriad

Welsh

Etymology

gwrthdorri (“to refract”) +‎ -iad.

Noun

gwrthdoriad m (plural gwrthdoriadau)

  1. (physics) refraction
    Synonyms: plygiad, gwyrdroad

Further reading

  • D. G. Lewis, N. Lewis, editors (2005–present), “gwrthdoriad”, in Gweiadur: the Welsh–English Dictionary, Gwerin
  • R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “gwrthdoriad”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies
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