Mithraeum
noun
Mith·rae·um
miˈthrēəm
plural Mithraea
-ēə
also Mithraeums : an underground room simulating a cave used for mithraic rites (as initiations)
Word History
Etymology
New Latin, from Greek Mithraion shrine of Mithras, from Mithras, Persian god of light and defender of truth, from Old Persian Mithra