The Collaborative International Dictionary of English v.0.48:

Dobson \Dob"son\, n. (Zool.)
   The aquatic larva of a large neuropterous insect (Corydalus
   cornutus), used as bait in angling. See Hellgamite.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dobson
    n 1: large brown aquatic larva of the dobsonfly; used as fishing
         bait [syn: hellgrammiate, dobson]
    2: large soft-bodied insect having long slender mandibles in the
       male; aquatic larvae often used as bait [syn: dobson,
       dobsonfly, dobson fly, Corydalus cornutus]

U.S. Gazetteer Places (2000):

Dobson, NC -- U.S. town in North Carolina
   Population (2000):    1457
   Housing Units (2000): 594
   Land area (2000):     1.790420 sq. miles (4.637166 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.790420 sq. miles (4.637166 sq. km)
   FIPS code:            17340
   Located within:       North Carolina (NC), FIPS 37
   Location:             36.391698 N, 80.721126 W
   ZIP Codes (1990):     27017
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dobson, NC
    Dobson