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.

Source : WordNet®

Scabiosa atropurpurea
     n : Old World annual having fragrant purple to deep crimson
         flower heads; naturalized in United States [syn: {sweet
         scabious}, {pincushion flower}, {mournful widow}]