<p><strong>Noun</strong></p><ul><li>the larva of the noctuid moth <em>Pseudaletia unipuncta</em>, which advances over a region in massive numbers, suggestive of an army, destroying crops of grain and vegetables.</li><li>any moth larva that is similar to the noctuid <em>Pseudaletia unipuncta</em> in its habit of advancing over a region in massive numbers, suggestive of an army, destroying agricultural crops.</li></ul>