WordReference Random House Unabridged Dictionary of American English © 2020
web•worm  (webwûrm′),USA pronunciation n. 
  1. Insectsthe 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.
  • web + worm 1790–1800, American

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