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shadfly

[shad-flahy]
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noun, plural shad·flies.
  1. mayfly(def 1).

Origin of shadfly

An Americanism dating back to 1830–40; so called because they hatch at the time of year when shad are running
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for shadfly

Historical Examples

  • We met with ephemer (shadfly) midway, about a mile from the shore, and they evidently fly over the whole lake.

    The Maine Woods

    Henry David Thoreau