The Collaborative International Dictionary of English v.0.48:

Walker \Walk"er\, n.
   1. One who walks; a pedestrian.
      [1913 Webster]

   2. That with which one walks; a foot. [Obs.]
      [1913 Webster]

            Lame Mulciber, his walkers quite misgrown.
                                                  --Chapman.
      [1913 Webster]

   3. (Law) A forest officer appointed to walk over a certain
      space for inspection; a forester.
      [1913 Webster]

   4. [AS. wealcere. See Walk, v. t., 3.] A fuller of cloth.
      [Obs. or Prov. Eng. & Scot.]
      [1913 Webster]

            She cursed the weaver and the walker
            The cloth that had wrought.           --Percy's
                                                  Reliques.
      [1913 Webster]

   5. (Zool.) Any ambulatorial orthopterous insect, as a stick
      insect.
      [1913 Webster]

   6. (construction, tunneling) A shift superintendent or
      assistant superintendent who supervises several
      shifters[4] and their crews. Since these crews are usually
      separated by some distance, the walker is frequently seen
      walking between them. Also called walking boss.
      [RDH]

   7. A low frame having casters or wheels, designed to enclose
      a baby on its sides and provide support while the baby is
      learning to walk; it usually has a seat so that the baby
      can sit while not walking.

   Syn: go-cart, baby-walker.
        [PJC]

   8. A low rectangular frame of light metal about waist high,
      usually having two horizontal arms mounted on four legs
      with an open rear, designed to be carried or pushed in
      front of a person whose legs are impaired, to provide
      support while walking; it may have wheels on two of the
      four legs.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

baby-walker \baby-walker\ n.
   a framework on small wheels or casters designed to support
   small children while they are learning to walk, and usually
   having a fabric support that permits the child to sit. Called
   also walker and go-cart.

   Syn: walker, go-cart
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Walker
    n 1: New Zealand runner who in 1975 became the first person to
         run a mile in less that 3 minutes and 50 seconds (born in
         1952) [syn: Walker, John Walker]
    2: United States writer (born in 1944) [syn: Walker, Alice
       Walker, Alice Malsenior Walker]
    3: a person who travels by foot [syn: pedestrian, walker,
       footer]
    4: a shoe designed for comfortable walking
    5: a light enclosing framework (trade name Zimmer) with rubber
       castors or wheels and handles; helps invalids or the
       handicapped or the aged to walk [syn: walker, Zimmer,
       Zimmer frame]
    6: an enclosing framework on casters or wheels; helps babies
       learn to walk [syn: walker, baby-walker, go-cart]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "walker":
   ambulator, baby buggy, baby carriage, backpacker, foot passenger,
   foot soldier, foot traveler, footslogger, gocart, hiker,
   hitchhiker, hoofer, infantryman, jaywalker, marcher, paddlefoot,
   pedestrian, perambulator, peripatetic, pram, stroller, trailsman,
   tramper, walkist



U.S. Gazetteer Counties (2000):

Walker -- U.S. County in Georgia
   Population (2000):    61053
   Housing Units (2000): 25577
   Land area (2000):     446.579812 sq. miles (1156.636353 sq. km)
   Water area (2000):    0.449722 sq. miles (1.164775 sq. km)
   Total area (2000):    447.029534 sq. miles (1157.801128 sq. km)
   Located within:       Georgia (GA), FIPS 13
   Location:             34.818692 N, 85.291825 W
   Headwords:
    Walker
    Walker, GA
    Walker County
    Walker County, GA


U.S. Gazetteer Counties (2000):

Walker -- U.S. County in Texas
   Population (2000):    61758
   Housing Units (2000): 21099
   Land area (2000):     787.449625 sq. miles (2039.485079 sq. km)
   Water area (2000):    13.987055 sq. miles (36.226305 sq. km)
   Total area (2000):    801.436680 sq. miles (2075.711384 sq. km)
   Located within:       Texas (TX), FIPS 48
   Location:             30.739811 N, 95.528876 W
   Headwords:
    Walker
    Walker, TX
    Walker County
    Walker County, TX


U.S. Gazetteer Counties (2000):

Walker -- U.S. County in Alabama
   Population (2000):    70713
   Housing Units (2000): 32417
   Land area (2000):     794.391238 sq. miles (2057.463774 sq. km)
   Water area (2000):    10.905690 sq. miles (28.245606 sq. km)
   Total area (2000):    805.296928 sq. miles (2085.709380 sq. km)
   Located within:       Alabama (AL), FIPS 01
   Location:             33.819888 N, 87.285406 W
   Headwords:
    Walker
    Walker, AL
    Walker County
    Walker County, AL


U.S. Gazetteer Places (2000):

Walker, MO -- U.S. city in Missouri
   Population (2000):    275
   Housing Units (2000): 125
   Land area (2000):     0.311200 sq. miles (0.806003 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.311200 sq. miles (0.806003 sq. km)
   FIPS code:            76660
   Located within:       Missouri (MO), FIPS 29
   Location:             37.898917 N, 94.229601 W
   ZIP Codes (1990):     64790
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Walker, MO
    Walker


U.S. Gazetteer Places (2000):

Walker, IA -- U.S. city in Iowa
   Population (2000):    750
   Housing Units (2000): 286
   Land area (2000):     0.703471 sq. miles (1.821981 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.703471 sq. miles (1.821981 sq. km)
   FIPS code:            81885
   Located within:       Iowa (IA), FIPS 19
   Location:             42.287342 N, 91.781400 W
   ZIP Codes (1990):     52352
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Walker, IA
    Walker


U.S. Gazetteer Places (2000):

Walker, LA -- U.S. town in Louisiana
   Population (2000):    4801
   Housing Units (2000): 1905
   Land area (2000):     5.751136 sq. miles (14.895372 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    5.751136 sq. miles (14.895372 sq. km)
   FIPS code:            79240
   Located within:       Louisiana (LA), FIPS 22
   Location:             30.489423 N, 90.862872 W
   ZIP Codes (1990):     70785
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Walker, LA
    Walker


U.S. Gazetteer Places (2000):

Walker, MI -- U.S. city in Michigan
   Population (2000):    21842
   Housing Units (2000): 9201
   Land area (2000):     25.155195 sq. miles (65.151653 sq. km)
   Water area (2000):    0.277030 sq. miles (0.717505 sq. km)
   Total area (2000):    25.432225 sq. miles (65.869158 sq. km)
   FIPS code:            82960
   Located within:       Michigan (MI), FIPS 26
   Location:             43.000891 N, 85.740036 W
   ZIP Codes (1990):     49504
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Walker, MI
    Walker


U.S. Gazetteer Places (2000):

Walker, MN -- U.S. city in Minnesota
   Population (2000):    1069
   Housing Units (2000): 517
   Land area (2000):     1.455847 sq. miles (3.770625 sq. km)
   Water area (2000):    0.001646 sq. miles (0.004264 sq. km)
   Total area (2000):    1.457493 sq. miles (3.774889 sq. km)
   FIPS code:            67792
   Located within:       Minnesota (MN), FIPS 27
   Location:             47.099689 N, 94.581168 W
   ZIP Codes (1990):     56484
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Walker, MN
    Walker