ELEUSINIANadj. Relating to Eleusis, in Greece, where certain famous rites or “mysteries.” were celebrated in honor of Ceres, though that discreet goddess commonly sent her regrets and had an engagement elsewhere. There is a good deal of uncertainty among the moderns as to what these mysteries really were. Some of the old Greek writers, who as small boys sneaked in under the tent, have attempted a description, but without success; the spirit was willing but the language was weak.