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What is "alder fly"

The Collaborative International Dictionary
Alder fly

alderfly \al"der*fly`\, Alder fly \Al"der fly\

  1. Any of numerous dark-colored neuropterous insects of the genus Sialis or allied genera. They have predaceous aquatic larv[ae], which are used for bait.

  2. (Angling) An artificial fly with brown mottled wings, body of peacock harl, and black legs.

WordNet
alder fly

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