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From Old Irish mosach, from Proto-Celtic *mussāko-, possibly from Proto-Indo-European *meh₂d-.


mosach (genitive singular masculine mosaigh, genitive singular feminine mosaí, plural mosacha, comparative mosaí)

  1. shaggy, rough, bristly
  2. bristly, grumpy, surly


Derived terms[edit]


Irish mutation
Radical Lenition Eclipsis
mosach mhosach not applicable
Note: Some of these forms may be hypothetical. Not every
possible mutated form of every word actually occurs.


  • Beekes, Robert S. P. (2010) Etymological Dictionary of Greek (Leiden Indo-European Etymological Dictionary Series; 10), with the assistance of Lucien van Beek, Leiden, Boston: Brill

Further reading[edit]

  • "mosach" in Foclóir Gaeilge-Béarla, An Gúm, 1977, by Niall Ó Dónaill.
  • shaggy” in New English-Irish Dictionary by Foras na Gaeilge.
  • mosach” in Dictionary of the Irish Language, Royal Irish Academy, 1913–76.
  • Entries containing “mosach” in English-Irish Dictionary, An Gúm, 1959, by Tomás de Bhaldraithe.
  • Entries containing “mosach” in New English-Irish Dictionary by Foras na Gaeilge.