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armyworm

[ahr-mee-wurm] /ˈɑr miˌwɜrm/
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
1735-1745
1735-45, Americanism; army + worm
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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