The Collaborative International Dictionary of English v.0.48:

Sagamore \Sag"a*more\, n.
   1. [Cf. Sachem.] The head of a tribe among the American
      Indians; a chief; -- generally used as synonymous with
      sachem, but some writters distinguished between them,
      making the sachem a chief of the first rank, and a
      sagamore one of the second rank. "Be it sagamore, sachem,
      or powwow." --Longfellow.
      [1913 Webster]

   2. A juice used in medicine. [Obs.] --Johnson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sagamore
    n 1: a chief of a North American tribe or confederation
         (especially an Algonquian chief) [syn: sachem,
         sagamore]

U.S. Gazetteer Places (2000):

Sagamore, MA -- U.S. Census Designated Place in Massachusetts
   Population (2000):    3544
   Housing Units (2000): 1532
   Land area (2000):     3.356184 sq. miles (8.692476 sq. km)
   Water area (2000):    0.152548 sq. miles (0.395097 sq. km)
   Total area (2000):    3.508732 sq. miles (9.087573 sq. km)
   FIPS code:            58965
   Located within:       Massachusetts (MA), FIPS 25
   Location:             41.785825 N, 70.530887 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Sagamore, MA
    Sagamore