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alderfly

al·der·fly [ áwldər fl ] (plural al·der·flies)


noun 
Definition:
 
flying insect with water-dwelling larvae: a slender-bodied insect with two pairs of prominently veined wings. The eggs are laid near water, and the larvae live in the water and have projecting feathery gills. Family Sialidae.

[ Alder because both it and the tree are found by streams]
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