Source : Webster's Revised Unabridged Dictionary (1913)

Pine \Pine\, v. t. [imp. & p. p. {Pined}; p. pr. & vb. n.
   {Pining}.] [AS. p[=i]nan to torment, fr. p[=i]n torment. See
   1st {Pine}, {Pain}, n. & v.]
   1. To inflict pain upon; to torment; to torture; to afflict.
      [Obs.] --Chaucer. Shak.

            That people that pyned him to death.  --Piers
                                                  Plowman.

            One is pined in prison, another tortured on the
            rack.                                 --Bp. Hall.

   2. To grieve or mourn for. [R.] --Milton.

Pining \Pin"ing\, a.
   1. Languishing; drooping; wasting away, as with longing.

   2. Wasting; consuming. ``The pining malady of France.''
      --Shak.

Source : WordNet®

pining
     n : a feeling of deep longing