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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 al·der·fly, Al·der fly.
 1. Any of numerous dark-colored neuropterous insects of the genus Sialis or allied genera. They have predaceous aquatic larvæ, which are used for bait.
 2.  Angling An artificial fly with brown mottled wings, body of peacock harl, and black legs.
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From: WordNet (r) 2.0

 alder fly
      n : dark-colored insect having predaceous aquatic larvae [syn: alderfly,
           Sialis lutaria]