Eleusinian

• (a.) Pertaining to Eleusis, in Greece, or to secret rites in honor of Ceres, there celebrated; as, Eleusinian mysteries or festivals.
Found on http://thinkexist.com/dictionary/meaning/eleusinian/

Eleusinian

El`eu·sin'i·an adjective [ Latin Eleusinius , Greek ....] Pertaining to Eleusis, in Greece, or to secret rites in honor of Ceres, there celebrated; as, Eleusinian mysteries or festivals.
Found on http://www.encyclo.co.uk/webster/E/20
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