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3 definitions found
 for army worm
From The Collaborative International Dictionary of English v.0.48 :

  armyworm \armyworm\, Army worm \Ar"my worm`\ (Zool.)
     (a) A lepidopterous insect, which in the larval state often
         travels in great multitudes from field to field,
         destroying grass, grain, and other crops. The common army
         worm of the northern United States is the noctuid moth
         ({Pseudaletia unipuncta, formerly Leucania unipuncta.
         The name is often applied to other related species, as
         the cotton worm.
     (b) The larva of a small two-winged fly ({Sciara), which
         marches in large companies, in regular order. See Cotton
         worm, under Cotton.
     Syn: army worm
          [1913 Webster]
     2. the larva of the fungus gnat; -- they march in large
        companies in regular order.
        [WordNet 1.5] Arna

From The Collaborative International Dictionary of English v.0.48 :

  Caterpillar \Cat"er*pil`lar\, n. [OE. catyrpel, corrupted fr.
     OF. chatepelouse, or cate pelue, fr. chate, F. chatte,
     she-cat, fem. of chat, L. catus + L. pilosus hairy, or F.
     pelu hairy, fr. L. pilus hair. See Cat, and Pile hair.]
     1. (Zool.) The larval state of a butterfly or any
        lepidopterous insect; sometimes, but less commonly, the
        larval state of other insects, as the sawflies, which are
        also called false caterpillars. The true caterpillars have
        three pairs of true legs, and several pairs of abdominal
        fleshy legs (prolegs) armed with hooks. Some are hairy,
        others naked. They usually feed on leaves, fruit, and
        succulent vegetables, being often very destructive, Many
        of them are popularly called worms, as the cutworm,
        cankerworm, army worm, cotton worm, silkworm.
        [1913 Webster]
     2. (Bot.) A plant of the genus Scorpiurus, with pods
        resembling caterpillars.
        [1913 Webster]
     Caterpillar catcher, or Caterpillar eater (Zool.), a bird
        belonging to the family of Shrikes, which feeds on
        caterpillars. The name is also given to several other
     Caterpillar hunter (Zool.), any species of beetles of the
        genus Callosoma and other allied genera of the family
        Carabid[ae] which feed habitually upon caterpillars.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  army worm
      n 1: noctuid moth larvae that travel in multitudes destroying
           especially grass and grain [syn: armyworm, army worm,
           Pseudaletia unipuncta]

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