Source : Webster's Revised Unabridged Dictionary (1913)

Calumet \Cal"u*met\, n. [F. calumet, fr. L. calamus reed. See
   {Halm}, and cf. {Shawm}.]
   A kind of pipe, used by the North American Indians for
   smoking tobacco. The bowl is usually made of soft red stone,
   and the tube is a long reed often ornamented with feathers.

         Smoked the calumet, the Peace pipe, As a signal to the
         nations.                                 --Lowgfellow.

   Note: The calumet is used as a symbol of peace. To accept the
         calumet is to agree to terms of peace, and to refuse it
         is to reject them. The calumet of peace is used to seal
         or ratify contracts and alliances, and as an evidence
         to strangers that they are welcome.

Source : WordNet®

calumet
     n : a highly decorated ceremonial pipe of Amerindians; smoked on
         ceremonial occasions (especially as a token of peace)
         [syn: {peace pipe}, {pipe of peace}]