Definition of alderfly in English:

alderfly

Syllabification: al·der·fly
Pronunciation: /ˈôldərˌflī
 
/
(also alder fly)

noun (plural alderflies)

A brownish flylike insect that lives near water and has predatory aquatic larvae.
  • Family Sialidae, order Neuroptera: several genera
More example sentences
  • Larvae of alderflies differ from hellgrammites in that they lack the two hooks at the end of the abdomen.
  • This is a very small order of Australian insects commonly known as alderflies and dobsonflies.
  • The alderfly larvae, known to all and coveted by fish and anglers alike, is the hellgrammite.

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