The Collaborative International Dictionary of English v.0.48:

Belle \Belle\ (b[e^]l), n. [F. belle, fem. of bel, beau,
   beautiful, fine. See Beau.]
   A young lady of superior beauty and attractions; a handsome
   lady, or one who attracts notice in society; a fair lady.
   [1913 Webster]

WordNet (r) 3.0 (2006):

belle
    n 1: a young woman who is the most charming and beautiful of
         several rivals; "she was the belle of the ball"

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "belle":
   Miss America, bathing beauty, beau ideal, beaut, beauty,
   beauty contest winner, beauty queen, bunny, charmer, cover girl,
   dazzler, dream, enchantress, fine lady, grande dame, great beauty,
   knockout, lady fair, looker, model, paragon, peach, pinup,
   pinup girl, precieuse, pussycat, raving beauty, reigning beauty,
   sex kitten, slick chick, stunner, toast



U.S. Gazetteer Places (2000):

Belle, WV -- U.S. town in West Virginia
   Population (2000):    1259
   Housing Units (2000): 647
   Land area (2000):     0.712822 sq. miles (1.846200 sq. km)
   Water area (2000):    0.073772 sq. miles (0.191068 sq. km)
   Total area (2000):    0.786594 sq. miles (2.037268 sq. km)
   FIPS code:            05836
   Located within:       West Virginia (WV), FIPS 54
   Location:             38.233853 N, 81.541606 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Belle, WV
    Belle


U.S. Gazetteer Places (2000):

Belle, MO -- U.S. city in Missouri
   Population (2000):    1344
   Housing Units (2000): 652
   Land area (2000):     1.265438 sq. miles (3.277468 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.265438 sq. miles (3.277468 sq. km)
   FIPS code:            04150
   Located within:       Missouri (MO), FIPS 29
   Location:             38.285256 N, 91.721646 W
   ZIP Codes (1990):     65013
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Belle, MO
    Belle