Source : Webster's Revised Unabridged Dictionary (1913)

Mourning \Mourn"ing\, a.
   1. Grieving; sorrowing; lamenting.

   2. Employed to express sorrow or grief; worn or used as
      appropriate to the condition of one bereaved or sorrowing;
      as, mourning garments; a mourning ring; a mourning pin,
      and the like.

   {Mourning bride} (Bot.), a garden flower ({Scabiosa
      atropurpurea}) with dark purple or crimson flowers in
      flattened heads.

   {Mourning dove} (Zo["o]l.), a wild dove ({Zenaidura
      macroura}) found throughout the United States; -- so named
      from its plaintive note. Called also {Carolina dove}. See
      Illust. under {Dove}.

   {Mourning warbler} (Zo["o]l.), an American ground warbler
      ({Geothlypis Philadelphia}). The male has the head, neck,
      and chest, deep ash-gray, mixed with black on the throat
      and chest; other lower parts are pure yellow.

Dove \Dove\, n. [OE. dove, duve, douve, AS. d?fe; akin to OS.
   d?ba, D. duif, OHG. t?ba, G. taube, Icel. d?fa, Sw. dufva,
   Dan. due, Goth. d?b?; perh. from the root of E. dive.]
   1. (Zo["o]l.) A pigeon of the genus {Columba} and various
      related genera. The species are numerous.

   Note: The domestic dove, including the varieties called
         {fantails}, {tumblers}, {carrier pigeons}, etc., was
         derived from the {rock pigeon} ({Columba livia}) of
         Europe and Asia; the {turtledove} of Europe, celebrated
         for its sweet, plaintive note, is {C. turtur} or
         {Turtur vulgaris}; the {ringdove}, the largest of
         European species, is {C. palumbus}; the {Carolina
         dove}, or {Mourning dove}, is {Zenaidura macroura}; the
         {sea dove} is the little auk ({Mergulus alle} or {Alle
         alle}). See {Turtledove}, {Ground dove}, and {Rock
         pigeon}. The dove is a symbol of innocence, gentleness,
         and affection; also, in art and in the Scriptures, the
         typical symbol of the Holy Ghost.

Source : WordNet®

mourning dove
     n : wild dove of the United States having a mournful call [syn:
         {Zenaidura macroura}]