Dob·son /ˈdɑbsən/
  Dob·son n. Zool. The aquatic larva of a large neuropterous insect (Corydalus cornutus), used as bait in angling. See Hellgamite.
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  dobson
       n 1: large brown aquatic larva of the dobsonfly; used as fishing
            bait [syn: hellgrammiate]
       2: large soft-bodied insect having long slender mandibles in
          the male; aquatic larvae often used as bait [syn: dobsonfly,
           dobson fly, Corydalus cornutus]