DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   calamus
       n 1: any tropical Asian palm of the genus Calamus; light tough
            stems are a source of rattan canes
       2: the aromatic root of the sweet flag used medicinally
       3: perennial marsh plant having swordlike leaves and aromatic
          roots [syn: sweet flag, calamus, sweet calamus, myrtle
    flag, flagroot, Acorus calamus]
       4: a genus of Sparidae [syn: Calamus, genus Calamus]
       5: the hollow spine of a feather [syn: quill, calamus,
          shaft]