insect
Americannoun
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any animal of the class Insecta, comprising small, air-breathing arthropods having the body divided into three parts (head, thorax, and abdomen), and having three pairs of legs and usually two pairs of wings.
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any small arthropod, such as a spider, tick, or centipede, having a superficial, general similarity to the insects.
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a contemptible or unimportant person.
adjective
noun
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any small air-breathing arthropod of the class Insecta, having a body divided into head, thorax, and abdomen, three pairs of legs, and (in most species) two pairs of wings. Insects comprise about five sixths of all known animal species, with a total of over one million named species
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(loosely) any similar invertebrate, such as a spider, tick, or centipede
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a contemptible, loathsome, or insignificant person
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Any of very numerous, mostly small arthropods of the class Insecta, having six segmented legs in the adult stage and a body divided into three parts (the head, thorax, and abdomen). The head has a pair of antennae and the thorax usually has one or two pairs of wings. Most insects undergo substantial change in form during development from the young to the adult stage. More than 800,000 species are known, most of them beetles. Other insects include flies, bees, ants, grasshoppers, butterflies, cockroaches, aphids, and silverfish.
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See Notes at biomass bug entomology
Other Word Forms
Derived Forms
Etymology
Origin of insect
First recorded in 1595–1605; from Latin insectum, noun use of neuter of insectus, past participle of insecāre “to incise, cut”; translation of Greek éntomon “insect,” literally, “notched or incised one”; see entomo-; cf. segment
Explanation
An insect is commonly called a bug. Flies, bees, and wasps are all insects. Insects are the tiny marvels of the natural world. From industrious ants to dazzling butterflies, these miniature critters come in all shapes, sizes, and colors, each with its own special role in ecosystems worldwide. With over a million species identified and countless more waiting to be discovered, insects continue to fascinate scientists and inspire curiosity in nature lovers everywhere. Insect comes from the Latin phrase animal insectum, which means "animal with a cut up (segmented) body."
Vocabulary lists containing insect
Buzzwords for National Honey Bee Day
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Cormac McCarthy's "The Road"
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A Cut Above: Sect, Sec
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Insect controls across the entire region also helped prevent the spread of diseases through mosquitoes, ticks and flies.
From Barron's • Dec. 17, 2025
Insect numbers are difficult to quantify but research suggests that in the longer term, the UK's flying insect population is in decline.
From BBC • Jul. 25, 2025
Insect buzz accompanies the come-ons of a devil.
From New York Times • Dec. 5, 2024
Insect repellents are not meant to kill insects, but work by dulling their senses to prevent them from finding humans, according to the National Pesticide Information Center.
From Los Angeles Times • Sep. 30, 2024
Velutha looked down at Ambassador S. Insect in his arms.
From "The God of Small Things" by Arundhati Roy
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
