Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various insects of the family Sialidae, having two pairs of dark many-veined wings, long antennae, and aquatic larvae.

from The Century Dictionary.

  • noun A name given by fishermen to a certain neuropterous insect of the family Sialidæ, used as, or imitated for use as, bait: so named because it occurs along alder-lined streams in England.

from the GNU version of the Collaborative International Dictionary of English.

  • Any of numerous dark-colored neuropterous insects of the genus Sialis or allied genera. They have predaceous aquatic larvæ, which are used for bait.
  • (Angling) An artificial fly with brown mottled wings, body of peacock harl, and black legs.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A member of any one of the sixty-six species of the Sialidae family of megalopteran insects, each specimen of which has a body length not exceeding one inch and possesses long filamentous antennae and four large dark wings.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun dark-colored insect having predaceous aquatic larvae
  • noun dark-colored insect having predaceous aquatic larvae

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Probably so called because the mature insects can be found resting on foliage in the moist habitats near lakes and streams where alders typically grow.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

alder +‎ fly

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