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alderfly

[awl-der-flahy] /ˈɔl dərˌflaɪ/
noun, plural alderflies.
1.
any of several dark-colored neuropterous insects of the family Sialidae, the larvae of which are aquatic and predacious on other aquatic insects.
Origin
1820-1830
1820-30; alder + fly2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for alder fly

alder fly

noun
1.
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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Encyclopedia Article for alder fly

alderfly

any insect of the megalopteran family Sialidae, characterized by long, filamentous antennae and two pairs of large wings (anterior wing length 20 to 50 mm [ 34 inch to 2 inches]), membranous and well-developed, with part of the hind wing folding like a fan. The adult alderfly is dark-coloured, 15 to 30 mm (35 inch to 1 15 inches) long, sluggish, and a weak flier. It usually inhabits shore vegetation, especially alder trees.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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