Source : Webster's Revised Unabridged Dictionary (1913)

Sorrow \Sor"row\, v. i. [imp. & p. p. {Sorrowed}; p. pr. & vb.
   n. {Sorrowing}.] [OE. sorowen, sorwen, sorhen, AS. sorgian;
   akin to Goth. sa['u]rgan. See {Sorrow}, n.]
   To feel pain of mind in consequence of evil experienced,
   feared, or done; to grieve; to be sad; to be sorry.

         Sorrowing most of all . . . that they should see his
         face no more.                            --Acts xx. 38.

         I desire no man to sorrow for me.        --Sir J.
                                                  Hayward.

Sorrow \Sor"row\, n. [OE. sorwe, sorewe, sor?e, AS. sorg, sorh;
   akin to D. zorg care, anxiety, OS. sorga, OHG. sorga, soraga,
   suorga, G. sorge, Icel., Sw., & Dan. sorg, Goth. sa['u]rga;
   of unknown origin.]
   The uneasiness or pain of mind which is produced by the loss
   of any good, real or supposed, or by diseappointment in the
   expectation of good; grief at having suffered or occasioned
   evil; regret; unhappiness; sadness. --Milton.

         How great a sorrow suffereth now Arcite! --Chaucer.

         The safe and general antidote against sorrow is
         employment.                              --Rambler.

   Syn: Grief; unhappiness; regret; sadness; heaviness;
        mourning; affliction. See {Affliction}, and {Grief}.

Source : WordNet®

sorrow
     n 1: an emotion of great sadness associated with loss or
          bereavement; "he tried to express his sorrow at her
          loss" [ant: {joy}]
     2: sadness associated with some wrong done or some
        disappointment; "he drank to drown his sorrows"; "he wrote
        a note expressing his regret"; "to his rue, the error cost
        him the game" [syn: {regret}, {rue}, {ruefulness}]
     3: something that causes great unhappiness; "her death was a
        great grief to John" [syn: {grief}]
     4: the state of being sad; "she tired of his perpetual sadness"
        [syn: {sadness}, {sorrowfulness}]
     v : feel grief; eat one's heart out [syn: {grieve}]