Definition of insect
1a : any of a class (Insecta) of arthropods (such as bugs or bees) with well-defined head, thorax, and abdomen, only three pairs of legs, and typically one or two pairs of wings
b : any of numerous small invertebrate animals (such as spiders or centipedes) that are more or less obviously segmented —not used technically
2 : a trivial or contemptible person
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