Definitions

from The Century Dictionary.

  • A class or other large division of invertebrated animals, to which different limits have been assigned.

from the GNU version of the Collaborative International Dictionary of English.

  • noun plural (Zoöl.) One of the classes of Arthropoda, including those that have one pair of antennæ, three pairs of mouth organs, and breathe air by means of tracheæ, 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.
  • noun plural (Zoöl.) In a more restricted sense, the Hexapoda alone. See Hexapoda.
  • noun plural (Zoöl.) In the most general sense, the Hexapoda, Myriapoda, and Arachnoidea, combined.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun insects; about five-sixths of all known animal species

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