Army worm

armyworm

[ahr-mee-wurm]
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:
1735–45, Americanism; army + worm

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
army worm
 
n
1.  the caterpillar of a widely distributed noctuid moth, Leucania unipuncta, which travels in vast hordes and is a serious pest of cereal crops in North America
2.  any of various similar caterpillars

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