Mithraeum

enUK

Mith·rae·um

or mith·rae·um (mĭth′rē-əm)n. pl. Mith·rae·a (-rē-ə) or mith·rae·a An often subterranean or semisubterranean temple dedicated to the worship of Mithras.
[New Latin, from Greek Mithraion, from Mithrās, Mithras; see Mithras.]