DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   agar
       n 1: any culture medium that uses agar as the gelling agent
            [syn: agar, nutrient agar]
       2: a colloidal extract of algae; used especially in culture
          media and as a gelling agent in foods [syn: agar, agar-
    agar]