DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   alder
       n 1: wood of any of various alder trees; resistant to underwater
            rot; used for bridges etc
       2: north temperate shrubs or trees having toothed leaves and
          conelike fruit; bark is used in tanning and dyeing and the
          wood is rot-resistant [syn: alder, alder tree]