Dictionary![]() ![]() al•der•flyPronunciation: (ôl'dur-flī"), [key] —n., —pl. -flies. any of several dark-colored neuropterous insects of the family Sialidae, the larvae of which are aquatic and predacious on other aquatic insects. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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