Druidism

from WordNet (r) 3.0 (2006)

druidism
    n 1: the system of religion and philosophy taught by the Druids
         and their rites and ceremonies

from The Collaborative International Dictionary of English v.0.48

Druidism \Dru"id*ism\, n.
   The system of religion, philosophy, and instruction, received
   and taught by the Druids; the rites and ceremonies of the
   Druids.
   [1913 Webster]