DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   emerald
       n 1: a green transparent form of beryl; highly valued as a
            gemstone
       2: a transparent piece of emerald that has been cut and polished
          and is valued as a precious gem
       3: the green color of an emerald