hirddydd haf

• (North Wales, standard) IPA^(key): /ˌhɪrðɨ̞ð ˈhaːv/
  • (North Wales, colloquial) IPA^(key): /ˌhɪrðɨ̞ð ˈhaː/
• (South Wales) IPA^(key): /ˌhɪrðɪð ˈhaːv/

hirddydd haf m (plural hirddyddiau haf, not mutable)

1. the summer solstice

   Synonyms: Alban Hefin, heuldro'r haf

   Antonyms: Alban Arthan, byrddydd gaeaf, heuldro'r gaeaf

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