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Noun: alderfly  'ol-du(r),flI
  1. Dark-coloured insect having predaceous aquatic larvae
    "Alderfly larvae are important indicators of water quality in freshwater ecosystems";
    - alder fly, Sialis lutaria

Derived forms: alder flies, alderflies

Type of: neuropteran, neuropteron, neuropterous insect

Part of: genus Sialis, Sialis

Encyclopedia: Alderfly