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[awl-der-flahy] /ˈɔl dərˌflaɪ/
noun, plural alderflies.
any of several dark-colored neuropterous insects of the family Sialidae, the larvae of which are aquatic and predacious on other aquatic insects.
Origin of alderfly
First recorded in 1820-30; alder + fly2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for alder fly
Historical Examples
  • All trout, particularly rainbows, take an alder fly readily.

    Chats on Angling H. V. Hart-Davis
British Dictionary definitions for alder fly

alder fly

any of various neuropterous insects of the widely distributed group Sialoidea, such as Sialis lutaria, that have large broad-based hind wings, produce aquatic larvae, and occur near water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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