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Old Irish[edit]


From Proto-Celtic *ɸētu, from Proto-Indo-European *peyH- (fat, milk).[1]


íath m[2]

  1. land, territory


Masculine u-stem
Singular Dual Plural
Nominative íath íathL íathae
Vocative íath íathL íathu
Accusative íathN íathL íathu
Genitive íathoH, íathaH íatho, íatha íathaeN
Dative íathL íathaib íathaib
Initial mutations of a following adjective:
  • H = triggers aspiration
  • L = triggers lenition
  • N = triggers nasalization


Old Irish mutation
Radical Lenition Nasalization
íath unchanged n-íath
Note: Some of these forms may be hypothetical. Not every
possible mutated form of every word actually occurs.


  1. ^ Matasović, Ranko (2009), “*fētu”, in Etymological Dictionary of Proto-Celtic (Leiden Indo-European Etymological Dictionary Series; 9), Leiden: Brill, →ISBN, page 129
  2. ^ Gregory Toner, Maire Ní Mhaonaigh, Sharon Arbuthnot, Dagmar Wodtko, Maire-Luise Theuerkauf, editors (2019), “íath”, in eDIL: Electronic Dictionary of the Irish Language