The Collaborative International Dictionary of English v.0.48:

Belvedere \Bel`ve*dere"\, n. [It., fr. bello, bel, beautiful +
   vedere to see.] (Arch.)
   A small building, or a part of a building, more or less open,
   constructed in a place commanding a fine prospect.
   [1913 Webster]

WordNet (r) 3.0 (2006):

belvedere
    n 1: densely branched Eurasian plant; foliage turns purple-red
         in autumn [syn: summer cypress, burning bush, fire
         bush, fire-bush, belvedere, Bassia scoparia, Kochia
         scoparia]
    2: a gazebo sited to command a fine view

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "belvedere":
   Havana, Texas tower, alcove, beacon, bleachers, box of cigars,
   bridge, cheroot, cigar, cigar box, cigar case, cigar cutter,
   cigarillo, colorado, conning tower, corona, gallery, gazebo,
   grandstand, humidor, lighthouse, lookout, loophole,
   observation post, observatory, outlook, overlook, pagoda,
   peanut gallery, peephole, pharos, ringside, ringside seat, rope,
   sighthole, stinker, stogie, top gallery, tower, trichinopoly,
   watchtower



U.S. Gazetteer Places (2000):

Belvedere, CA -- U.S. city in California
   Population (2000):    2125
   Housing Units (2000): 1059
   Land area (2000):     0.535411 sq. miles (1.386708 sq. km)
   Water area (2000):    1.886093 sq. miles (4.884958 sq. km)
   Total area (2000):    2.421504 sq. miles (6.271666 sq. km)
   FIPS code:            05164
   Located within:       California (CA), FIPS 06
   Location:             37.874559 N, 122.465823 W
   ZIP Codes (1990):     94920
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Belvedere, CA
    Belvedere


U.S. Gazetteer Places (2000):

Belvedere, SC -- U.S. Census Designated Place in South Carolina
   Population (2000):    5631
   Housing Units (2000): 2430
   Land area (2000):     3.919878 sq. miles (10.152438 sq. km)
   Water area (2000):    0.005628 sq. miles (0.014577 sq. km)
   Total area (2000):    3.925506 sq. miles (10.167015 sq. km)
   FIPS code:            05410
   Located within:       South Carolina (SC), FIPS 45
   Location:             33.531985 N, 81.943338 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Belvedere, SC
    Belvedere