The Collaborative International Dictionary of English v.0.48:

Dexter \Dex"ter\, n. [Prob. so named after the original
   breeder.]
   One of a breed of small hardy cattle originating from the
   Kerry breed of Ireland, valuable both for beef and milk. They
   are usually chiefly black, sometimes red, and somewhat
   resemble a small shorthorn in build. Called also Dexter
   Kerry.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Dexter \Dex"ter\ (d[e^]ks"t[~e]r), a. [L.,; akin to Gr. ?, ?,
   Skr. dakshi[.n]a (cf. daksh to be strong, suit); Goth.
   taihswa, OHG. zeso. Cf. Dexterous.]
   1. Pertaining to, or situated on, the right hand; right, as
      opposed to sinister, or left.
      [1913 Webster]

            On sounding wings a dexter eagle flew. --Pope.
      [1913 Webster]

   2. (Her.) On the right-hand side of a shield, i. e., towards
      the right hand of its wearer. To a spectator in front, as
      in a pictorial representation, this would be the left
      side.
      [1913 Webster]

   Dexter chief, or Dexter point (Her.), a point in the
      dexter upper corner of the shield, being in the dexter
      extremity of the chief, as A in the cut.

   Dexter base, a point in the dexter lower part or base of
      the shield, as B in the cut.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dexter
    adj 1: on or starting from the wearer's right

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "dexter":
   astarboard, auspicious, benign, bright, clockwise, conservative,
   dextrad, dextral, dextrally, dextrocardial, dextrocerebral,
   dextrocular, dextrogyrate, dextrogyratory, dextropedal,
   dextrorotary, dextrorse, fortunate, off, on the right, propitious,
   reactionary, right, right-hand, right-wing, right-wingish,
   rightward, rightwardly, rightwards, starboard, to the right,
   white



U.S. Gazetteer Places (2000):

Dexter, NM -- U.S. town in New Mexico
   Population (2000):    1235
   Housing Units (2000): 434
   Land area (2000):     0.734602 sq. miles (1.902611 sq. km)
   Water area (2000):    0.058888 sq. miles (0.152520 sq. km)
   Total area (2000):    0.793490 sq. miles (2.055131 sq. km)
   FIPS code:            20620
   Located within:       New Mexico (NM), FIPS 35
   Location:             33.196062 N, 104.370222 W
   ZIP Codes (1990):     88230
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, NM
    Dexter


U.S. Gazetteer Places (2000):

Dexter, NY -- U.S. village in New York
   Population (2000):    1120
   Housing Units (2000): 455
   Land area (2000):     0.414091 sq. miles (1.072492 sq. km)
   Water area (2000):    0.071567 sq. miles (0.185357 sq. km)
   Total area (2000):    0.485658 sq. miles (1.257849 sq. km)
   FIPS code:            20500
   Located within:       New York (NY), FIPS 36
   Location:             44.008264 N, 76.045363 W
   ZIP Codes (1990):     13634
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, NY
    Dexter


U.S. Gazetteer Places (2000):

Dexter, GA -- U.S. town in Georgia
   Population (2000):    509
   Housing Units (2000): 231
   Land area (2000):     0.759247 sq. miles (1.966441 sq. km)
   Water area (2000):    0.015064 sq. miles (0.039015 sq. km)
   Total area (2000):    0.774311 sq. miles (2.005456 sq. km)
   FIPS code:            22752
   Located within:       Georgia (GA), FIPS 13
   Location:             32.434580 N, 83.058904 W
   ZIP Codes (1990):     31019
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, GA
    Dexter


U.S. Gazetteer Places (2000):

Dexter, IA -- U.S. city in Iowa
   Population (2000):    689
   Housing Units (2000): 270
   Land area (2000):     1.191683 sq. miles (3.086445 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.191683 sq. miles (3.086445 sq. km)
   FIPS code:            21225
   Located within:       Iowa (IA), FIPS 19
   Location:             41.515617 N, 94.227115 W
   ZIP Codes (1990):     50070
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, IA
    Dexter


U.S. Gazetteer Places (2000):

Dexter, KS -- U.S. city in Kansas
   Population (2000):    364
   Housing Units (2000): 133
   Land area (2000):     0.277995 sq. miles (0.720003 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.277995 sq. miles (0.720003 sq. km)
   FIPS code:            17925
   Located within:       Kansas (KS), FIPS 20
   Location:             37.179373 N, 96.715987 W
   ZIP Codes (1990):     67038
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, KS
    Dexter


U.S. Gazetteer Places (2000):

Dexter, ME -- U.S. Census Designated Place in Maine
   Population (2000):    2201
   Housing Units (2000): 1151
   Land area (2000):     4.760736 sq. miles (12.330249 sq. km)
   Water area (2000):    0.583458 sq. miles (1.511149 sq. km)
   Total area (2000):    5.344194 sq. miles (13.841398 sq. km)
   FIPS code:            17495
   Located within:       Maine (ME), FIPS 23
   Location:             45.020594 N, 69.292374 W
   ZIP Codes (1990):     04930
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, ME
    Dexter


U.S. Gazetteer Places (2000):

Dexter, MI -- U.S. village in Michigan
   Population (2000):    2338
   Housing Units (2000): 1106
   Land area (2000):     1.890512 sq. miles (4.896404 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.890512 sq. miles (4.896404 sq. km)
   FIPS code:            22160
   Located within:       Michigan (MI), FIPS 26
   Location:             42.333986 N, 83.881616 W
   ZIP Codes (1990):     48130
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, MI
    Dexter


U.S. Gazetteer Places (2000):

Dexter, MN -- U.S. city in Minnesota
   Population (2000):    333
   Housing Units (2000): 133
   Land area (2000):     1.448809 sq. miles (3.752397 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.448809 sq. miles (3.752397 sq. km)
   FIPS code:            15886
   Located within:       Minnesota (MN), FIPS 27
   Location:             43.718034 N, 92.704471 W
   ZIP Codes (1990):     55926
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, MN
    Dexter


U.S. Gazetteer Places (2000):

Dexter, MO -- U.S. city in Missouri
   Population (2000):    7356
   Housing Units (2000): 3560
   Land area (2000):     6.089312 sq. miles (15.771245 sq. km)
   Water area (2000):    0.128596 sq. miles (0.333062 sq. km)
   Total area (2000):    6.217908 sq. miles (16.104307 sq. km)
   FIPS code:            19396
   Located within:       Missouri (MO), FIPS 29
   Location:             36.796655 N, 89.962518 W
   ZIP Codes (1990):     63841
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dexter, MO
    Dexter