- any member of the pre-Celtic inhabitants of Ireland who were defeated by the Tuatha De Danann.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for firbolg
A third band, the Firbolg proper, took possession of Munster.
Tradition assigns it to ngus, a Firbolg chief who lived about two thousand years ago.Romantic Ireland; volume 2/2
M.F and B. McM. Mansfield
In the dim days of Fomorian and Firbolg, and for ages after, Erin was a land of forests, full of wild cattle and deer and wolves.Ireland, Historic and Picturesque
In each of the three islands are found ancient forts or duns, which are traditionally attributed to the Firbolg or Belgic race.Insula Sanctorum et Doctorum