armyworm

[ ahr-mee-wurm ]
/ ˈɑr miˌwɜrm /

noun

the caterpillar of a noctuid moth, Pseudaletia unipuncta, that often travels in large numbers over a region, destroying crops of wheat, corn, etc.
any of the larvae of several related moths having similar habits.

Origin of armyworm

An Americanism dating back to 1735–45; army + worm

Words nearby armyworm

army of occupation, army of the potomac, army of the united states, army worm, army-navy store, armyworm, arnatto, arnaud, arnauld, arndt, arndt's law

British Dictionary definitions for army worm

army worm

noun

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
any of various similar caterpillars