The Collaborative International Dictionary of English v.0.48:

Excelsior \Ex*cel"si*or\, n.
   A kind of stuffing for upholstered furniture, mattresses,
   etc., in which curled shreds of wood are substituted for
   curled hair.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Excelsior \Ex*cel"si*or\, a. [L., compar. of excelsus elevated,
   lofty, p. p. of excellere. See Excel, v. t.]
   More lofty; still higher; ever upward.
   [1913 Webster]

WordNet (r) 3.0 (2006):

excelsior
    n 1: thin curly wood shavings used for packing or stuffing [syn:
         excelsior, wood shavings]

U.S. Gazetteer Places (2000):

Excelsior, MN -- U.S. city in Minnesota
   Population (2000):    2393
   Housing Units (2000): 1254
   Land area (2000):     0.625972 sq. miles (1.621260 sq. km)
   Water area (2000):    0.047039 sq. miles (0.121831 sq. km)
   Total area (2000):    0.673011 sq. miles (1.743091 sq. km)
   FIPS code:            20078
   Located within:       Minnesota (MN), FIPS 27
   Location:             44.900616 N, 93.566740 W
   ZIP Codes (1990):     55331
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Excelsior, MN
    Excelsior