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2 definitions found
 for Insecta
From The Collaborative International Dictionary of English v.0.48 :

  Insecta \In*sec"ta\, n. pl. [NL. See Insect.]
     1. (Zool.) One of the classes of Arthropoda, including those
        that have one pair of antenn[ae], three pairs of mouth
        organs, and breathe air by means of trache[ae], opening by
        spiracles along the sides of the body. In this sense it
        includes the Hexapoda, or six-legged insects and the
        Myriapoda, with numerous legs. See Insect, n.
        [1913 Webster]
     2. (Zool.) In a more restricted sense, the Hexapoda alone.
        See Hexapoda.
        [1913 Webster]
     3. (Zool.) In the most general sense, the Hexapoda,
        Myriapoda, and Arachnoidea, combined.
        [1913 Webster]
     Note: The typical Insecta, or hexapod insects, are divided
           into several orders, viz.: Hymenoptera, as the bees
           and ants; Diptera, as the common flies, gnats, and
           mosquitos; Aphaniptera, or fleas; Lepidoptera, or
           moths and butterflies; Neuroptera, as the ant-lions
           and hellgamite; Coleoptera, or beetles; Hemiptera,
           as bugs, lice, aphids; Orthoptera, as grasshoppers
           and cockroaches; Pseudoneuroptera, as the dragon
           flies and termites; Euplexoptera, or earwigs;
           Thysanura, as the springtails, podura, and lepisma.
           See these words in the Vocabulary.
           [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: insects; about five-sixths of all known animal species
           [syn: Insecta, class Insecta, Hexapoda, class

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