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fall webworm

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noun
  1. See under webworm.

Origin of fall webworm

An Americanism dating back to 1860–65

webworm

[web-wurm]
noun
  1. the larva of any of several moths, as Hyphantria cunea (fall webworm) or Loxostege similalis (garden webworm), which spins a web over the foliage on which it feeds.

Origin of webworm

An Americanism dating back to 1790–1800; web + worm
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018