Definitions for dobsonflyˈdɒb sənˌflaɪ
Random House Webster's College Dictionary
a very large, soft-bodied neuropteran insect, Corydalus cornutus, commonly seen in fluttery flight above streams, noted for its abundant aquatic larvae.
Ref: Compare hellgrammite.
Origin of dobsonfly:
1900–05; appar. after surname Dobson
dobson, dobsonfly, dobson fly, Corydalus cornutus(noun)
large soft-bodied insect having long slender mandibles in the male; aquatic larvae often used as bait
An insect of the subfamily Corydalinae whose males have long mandibles, found in the Americas and related mostly closely to the fishfly.