Source : Webster's Revised Unabridged Dictionary (1913)

Easter lily \Eas"ter lil`y\ (Bot.)
   Any one of various lilies or lilylike flowers which bloom
   about Easter; specif.:
   (a) The common white lily ({Lilium candidum}), called also
       {Annunciation lily}.
   (b) The larger white lily ({Lilium longiflorum eximium}, syn.
       {L. Harrisii}) called also {Bermuda lily}.
   (c) The daffodil ({Narcissus Pseudo-Narcissus}).
   (d) The Atamasco lily.

Source : WordNet®

Easter lily
     n : tall lily have large white trumpet-shaped flowers that bloom
         in the spring [syn: {Bermuda lily}, {white trumpet lily},
          {Lilium longiflorum}]