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From Proto-Brythonic *bɨw, from Proto-Celtic *biwos, from Proto-Indo-European *gʷih₃wós, from *gʷeyh₃- (to live).



byw (feminine singular byw, plural bywion, not comparable)

  1. alive, living, having life, animate, quick, existing, actual
  2. lively, full of life, vivacious, vigorous, sprightly, spirited, eager, sparkling; vivid, graphic, susceptible to
  3. live (of a performance etc.)


byw m (plural bywion)

  1. living person or soul, living creature
  2. living, life, lifetime; energy, vigor, vitality
  3. the quick, the living flesh, the soft part of bread


byw (invariable)

  1. to live

Usage notes[edit]

Byw does not conjugate and must be used with periphrasis.

Roedd o’n byw yng Nghaerdydd.
He lived in Cardiff.

Derived terms[edit]

Related terms[edit]


Welsh mutation
radical soft nasal aspirate
byw fyw myw unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

Further reading[edit]

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