Source : Webster's Revised Unabridged Dictionary (1913)

Eisteddfod \Eis*tedd"fod\, n. [W., session, fr. eistedd to sit.]
   Am assembly or session of the Welsh bards; an annual congress
   of bards, minstrels and literati of Wales, -- being a
   patriotic revival of the old custom.

Source : WordNet®

eisteddfod
     n : any of several annual Welsh festivals involving artistic
         competitions (especially in singing)
     [also: {eisteddfodau} (pl)]