GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Corydalus prop. n. The type genus of the Corydalidae.  It includes the dobsonfly (Corydalus cornutus), whose aquatic larva, the hellgrammite, is used as bait in fishing.
   
   Syn. -- genus Corydalus, genus Corydalis.
   
   [WordNet 1.5 +PJC]