n. - One of the Insecta; esp., one of the Hexapoda. See Insecta.
n. - Any air-breathing arthropod, as a spider or scorpion.
n. - Any small crustacean. In a wider sense, the word is often loosely applied to various small invertebrates.
n. - Fig.: Any small, trivial, or contemptible person or thing.
a. - Of or pertaining to an insect or insects.
a. - Like an insect; small; mean; ephemeral.