[1] : The Collaborative International Dictionary of English v.0.48

mourner \mourn"er\ m=orn"~er, n.
   1. one who mourns or is grieved at any misfortune, as the
      death of a friend.
      1913 webster

            his mourners were two hosts, his friends and foes.
                                                  --byron.
      1913 webster

   2. one who attends a funeral as a hired mourner.
      1913 webster

            mourners were provided to attend the funeral.
                                                  --l'estrange.
      1913 webster

[2] : WordNet (r) 2.0

mourner
     n : a person who is feeling grief as grieving over someone who
         has died syn: griever, sorrower, lamenter
see also:
griever sorrower lamenter 

Mourner >> M Words
Mourner, definition of term: Mourner
mourner_pag1.html