nGéadal (Ngéadal or Ngeadal) is the Irish name of the thirteenth letter of the Ogham alphabet, ᚍ.
The Bríatharogam (kennings) for the letter are:
Its meaning is probably "[the act of] wounding". In Old Irish, the letter name was Gétal. It may be a verbal noun of gonid 'wounds, slays'. in which case is related to Welsh gwanu 'to pierce, to stab', which comes from the root was * 'to pierce, to strike'. Its original phonetic value in Primitive Irish was pronounced as /[ɡʷ]/, the voiced labiovelar. In Old Irish, this phoneme merged with g (gort), and the medieval manuscript tradition assigns it Latin ng pronounced as /[ŋ]/, hence the unetymological spelling of the letter name with initial n-.