Source : Webster's Revised Unabridged Dictionary (1913)

Comforter \Com"fort*er\, n.
   1. One who administers comfort or consolation.

            Let no comforter delight mine ear But such a one
            whose wrongs do suit with mine.       --Shak.

   2. (Script.) The Holy Spirit, -- referring to his office of
      comforting believers.

            But the Comforter, which is the Holy Ghost, whom the
            Father will send in my name, he shall teach you all
            things.                               --John xiv.
                                                  26.

   3. A knit woolen tippet, long and narrow. [U. S.]

            The American schoolboy takes off his comforter and
            unbuttons his jacket before going in for a snowball
            fight.                                --Pop. Sci.
                                                  Monthly.

   4. A wadded bedquilt; a comfortable. [U. S.]

   {Job's comforter}, a boil. [Colloq.]

Source : WordNet®

comforter
     n 1: commiserates with someone who has had misfortune [syn: {sympathizer},
           {sympathiser}]
     2: a person who reduces the intensity (e.g., of fears) and
        calms and pacifies; "a reliever of anxiety"; "an allayer
        of fears" [syn: {reliever}, {allayer}]
     3: bedding made of two layers of cloth filled with stuffing and
        stitched together [syn: {quilt}, {puff}]
     4: device used for an infant to suck or bite on [syn: {pacifier},
         {baby's dummy}, {teething ring}]