alder fly

alderfly

[awl-der-flahy]
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:
1820–30; alder + fly2

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World English Dictionary
alder fly
 
n
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

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