The Collaborative International Dictionary of English v.0.48:

Shell \Shell\, v. t. [imp. & p. p. Shelled; p. pr. & vb. n.
   Shelling.]
   1. To strip or break off the shell of; to take out of the
      shell, pod, etc.; as, to shell nuts or pease; to shell
      oysters.
      [1913 Webster]

   2. To separate the kernels of (an ear of Indian corn, wheat,
      oats, etc.) from the cob, ear, or husk.
      [1913 Webster]

   3. To throw shells or bombs upon or into; to bombard; as, to
      shell a town.
      [1913 Webster]

   To shell out, to distribute freely; to bring out or pay, as
      money. [Colloq.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shelled \Shelled\, a. (Zool.)
   Having a shell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

shelled
    adj 1: of animals or fruits that have a shell [ant: shell-
           less, unshelled]