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:

Shelling \Shell"ing\, n.
   Groats; hulled oats. --Simmonds.
   [1913 Webster]

WordNet (r) 3.0 (2006):

shelling
    n 1: the heavy fire of artillery to saturate an area rather than
         hit a specific target; "they laid down a barrage in front
         of the advancing troops"; "the shelling went on for hours
         without pausing" [syn: barrage, barrage fire,
         battery, bombardment, shelling]