Welsh Edit

Alternative forms Edit

Etymology Edit

From Middle Welsh hy-, from Old Welsh hi-, from Proto-Brythonic *hu-, from Proto-Celtic *su-, from Proto-Indo-European *h₁su- (good). Cognate with Cornish he- and Ancient Greek εὐ- (eu-, good).

Pronunciation Edit

Prefix Edit


  1. affirmative prefix, emphasises prefixed word
    hy- + ‎plyg (folded) → ‎hyblyg (flexible)
    hy- + ‎byw (alive) → ‎hyfyw (viable)
    hy- + ‎glân (clean) → ‎hylan (hygienic)

Derived terms Edit

References Edit

  • R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “hy-”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies