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: Webster's Revised Unabridged Dictionary (1913)