DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   mounter
       n 1: a skilled worker who mounts pictures or jewels etc.
       2: someone who ascends on foot; "a solitary mounter of the
          staircase" [syn: mounter, climber]