The Collaborative International Dictionary of English v.0.48:

morel \mor"el\ (m[o^]r"[e^]l), n. [See moril.] (Bot.)
   An edible fungus (Morchella esculenta), the upper part of
   which is covered with a reticulated and pitted hymenium. It
   is used as food, and for flavoring sauces. [Written also
   moril.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

Morchella esculenta
    n 1: an edible and choice morel with a globular to elongate head
         with an irregular pattern of pits and ridges [syn: common
         morel, Morchella esculenta, sponge mushroom, sponge
         morel]