The Collaborative International Dictionary of English v.0.48:

morel \mor"el\, n. [See morelle.] (Bot.)
   1. Nightshade; -- so called from its blackish purple berries.
      [Written also morelle.]
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   2. A kind of cherry. See Morello.
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   Great morel, the deadly nightshade.

   Petty morel, the black nightshade. See Nightshade.
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The Collaborative International Dictionary of English v.0.48:

Morelle \Mo*relle"\, n. [F., orig. fem. of moreau black, OF.
   morel, fr. LL. morellus. Cf. Morello, Murrey.] (Bot.)
   Nightshade. See 2d Morel.
   [1913 Webster]