calamus in WordNet English dictionary

1. perennial marsh plant having swordlike leaves and aromatic roots
   sweet flag  calamus  sweet calamus  myrtle flag  flagroot  Acorus calamus 
   
2. the hollow spine of a feather
   quill  calamus  shaft 
   
3. any tropical Asian palm of the genus Calamus; light tough stems are a source of rattan canes
   calamus 
   
4. the aromatic root of the sweet flag used medicinally
   calamus