The Collaborative International Dictionary of English v.0.48:

Elysium \E*ly"sium\, n.; pl. E. Elysiums, L. Elysia. [L.,
   fr. Gr. ?, ? ?, Elysian field.] (Anc. Myth.)
   1. A dwelling place assigned to happy souls after death; the
      seat of future happiness; Paradise.
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   2. Hence, any delightful place.
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            An Elysian more pure and bright than that pf the
            Greeks.                               --I. Taylor.
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