The Collaborative International Dictionary of English v.0.48:

Hickory \Hick"o*ry\, n. [North American Indian pawcohiccora
   (Capt. J. Smith) a kind of milk or oily liquor pressed from
   pounded hickory nuts. "Pohickory" is named in a list of
   Virginia trees, in 1653, and this was finally shortened to
   "hickory." --J. H. Trumbull.] (Bot.)
   An American tree of the genus Carya, of which there are
   several species. The shagbark is the Carya alba, and has a
   very rough bark; it affords the hickory nut of the markets.
   The pignut, or brown hickory, is the Carya glabra. The
   swamp hickory is Carya amara, having a nut whose shell is
   very thin and the kernel bitter.
   [1913 Webster]

   Hickory shad. (Zool.)
   (a) The mattowacca, or fall herring.
   (b) The gizzard shad.
       [1913 Webster]

WordNet (r) 3.0 (2006):

hickory
    n 1: valuable tough heavy hardwood from various hickory trees
    2: American hardwood tree bearing edible nuts [syn: hickory,
       hickory tree]

U.S. Gazetteer Counties (2000):

Hickory -- U.S. County in Missouri
   Population (2000):    8940
   Housing Units (2000): 6184
   Land area (2000):     398.628219 sq. miles (1032.442304 sq. km)
   Water area (2000):    13.109916 sq. miles (33.954526 sq. km)
   Total area (2000):    411.738135 sq. miles (1066.396830 sq. km)
   Located within:       Missouri (MO), FIPS 29
   Location:             37.916612 N, 93.333791 W
   Headwords:
    Hickory
    Hickory, MO
    Hickory County
    Hickory County, MO


U.S. Gazetteer Places (2000):

Hickory, NC -- U.S. city in North Carolina
   Population (2000):    37222
   Housing Units (2000): 16571
   Land area (2000):     28.068538 sq. miles (72.697177 sq. km)
   Water area (2000):    0.007093 sq. miles (0.018370 sq. km)
   Total area (2000):    28.075631 sq. miles (72.715547 sq. km)
   FIPS code:            31060
   Located within:       North Carolina (NC), FIPS 37
   Location:             35.737682 N, 81.328372 W
   ZIP Codes (1990):     28601 28602
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Hickory, NC
    Hickory


U.S. Gazetteer Places (2000):

Hickory, OK -- U.S. town in Oklahoma
   Population (2000):    87
   Housing Units (2000): 40
   Land area (2000):     0.551604 sq. miles (1.428649 sq. km)
   Water area (2000):    0.003346 sq. miles (0.008665 sq. km)
   Total area (2000):    0.554950 sq. miles (1.437314 sq. km)
   FIPS code:            34150
   Located within:       Oklahoma (OK), FIPS 40
   Location:             34.559558 N, 96.856941 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Hickory, OK
    Hickory


U.S. Gazetteer Places (2000):

Hickory, MS -- U.S. town in Mississippi
   Population (2000):    499
   Housing Units (2000): 207
   Land area (2000):     0.931167 sq. miles (2.411712 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.931167 sq. miles (2.411712 sq. km)
   FIPS code:            31980
   Located within:       Mississippi (MS), FIPS 28
   Location:             32.316880 N, 89.023376 W
   ZIP Codes (1990):     39332
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Hickory, MS
    Hickory