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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
alderfly

noun
dark-colored insect having predaceous aquatic larvae 
WordNet® 3.0, © 2006 by Princeton University.
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