
1) Irish folklore 2) Mythological monster 3) Tuatha Dé Danann
Found on
https://www.crosswordclues.com/clue/oilliphéist

The Oilliphéist ({etymology|ga|oll|great||péist|worm, fabulous beast, monster, reptile}) is a dragon-like monster in Irish mythology. The Scottish Gaelic equivalent is called Uilepheist. In one story, the Oilliphéist cuts the route of the River Shannon when it hears that Saint Patrick has come to drive out it and its kind. In a comic addition t...
Found on
http://en.wikipedia.org/wiki/Oilliphéist
No exact match found.