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armyworm

[ahr-mee-wurm]
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noun
  1. the caterpillar of a noctuid moth, Pseudaletia unipuncta, that often travels in large numbers over a region, destroying crops of wheat, corn, etc.
  2. any of the larvae of several related moths having similar habits.

Origin of armyworm

An Americanism dating back to 1735–45; army + worm
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018