Webster's English Dictionary

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calamus

cal.a.mus \'kal-*-m*s\ \-.mi-, -.me-\ n or cal.a.mi [L, reed, reed pen, fr. 
   Gk kalamos - more at HAULM] pl  1: the sweet flag (Acorus calamus) or its 
   aromatic root  2: the barrel of a feather : QUILL