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From Middle Welsh blwyðyn, from Old Welsh bloidin, from Proto-Brythonic *bluɨðẹn (compare Cornish bledhen, Breton blizen), from Proto-Celtic *blēdanī (compare Old Irish blíadain), from *blēdū (compare Welsh blwydd (age; year(s) old)).[1]



blwyddyn f (plural blynyddoedd or blynyddau)

  1. year

Usage notes[edit]

In Welsh, blwydd refers to age and is the word used for a single year and is also found after numbers. The plural blwyddi is little utilised. When referring to any other kind of year, the word is blwyddyn in the singular, blynyddoedd in the plural and the special form blynedd is used after numbers.

Derived terms[edit]

See also[edit]


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


  1. ^ Schrijver, Peter C. H. (1995) Studies in British Celtic historical phonology (Leiden studies in Indo-European; 5), Amsterdam, Atlanta: Rodopi, page 245

Further reading[edit]

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