Source : Webster's Revised Unabridged Dictionary (1913)

Insecta \In*sec"ta\, n. pl. [NL. See {Insect}.]
   1. (Zo["o]l.) 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.

   2. (Zo["o]l.) In a more restricted sense, the Hexapoda alone.
      See {Hexapoda}.

   3. (Zo["o]l.) In the most general sense, the Hexapoda,
      Myriapoda, and Arachnoidea, combined.

   Note: The typical Insecta, or hexapod insects, are divided
         into several orders, viz.: {Hymenoptera}, as the bees
         and ants; {Diptera}, as the common flies and gnats;
         {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 earwings; {Thysanura},
         as the springtails, podura, and lepisma. See these
         words in the Vocabulary.

Coleoptera \Co`le*op"te*ra\, n. pl. [NL., fr. Gr. ?
   sheath-winged; ? sheath + ? wing.] (Zo["o]l.)
   An order of insects having the anterior pair of wings
   (elytra) hard and horny, and serving as coverings for the
   posterior pair, which are membranous, and folded transversely
   under the others when not in use. The mouth parts form two
   pairs of jaws (mandibles and maxill[ae]) adapted for chewing.
   Most of the Coleoptera are known as beetles and weevils.

Source : WordNet®

Coleoptera
     n : beetles [syn: {order Coleoptera}]