caterpillar

1 of 2

noun

cat·​er·​pil·​lar ˈka-tər-ˌpi-lər How to pronounce caterpillar (audio)
-tə-
often attributive
: the elongated wormlike larva of a butterfly or moth
also : any of various similar larvae

Caterpillar

2 of 2

trademark

used for a tractor made for use on rough or soft ground and moved on two endless metal belts

Examples of caterpillar in a Sentence

Recent Examples on the Web
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Noun
Found only in a tiny six-square-mile patch of Oahu, Hawaii, this caterpillar lives inside spiderwebs. Popular Science Team, Popular Science, 16 July 2025 When the eggs hatch, the larvae eat the caterpillar from the inside out. Avery Hurt, Discover Magazine, 14 July 2025 They are used as trap crops in veggie gardens to draw aphids away from food crops or used to attract beneficial insects that feed on caterpillars, aphids, and more. Lauren Landers, Better Homes & Gardens, 20 June 2025 From the master-of-disguise frogfish to a butt-biting jackal and a multi headed caterpillar playing the decoy, these are the masters of deception and deceit. Tony Maglio, HollywoodReporter, 27 May 2025 See All Example Sentences for caterpillar

Word History

Etymology

Noun

Middle English catyrpel, from Anglo-French *catepelose, literally, hairy cat

First Known Use

Noun

15th century, in the meaning defined above

Time Traveler
The first known use of caterpillar was in the 15th century

Browse Nearby Words

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Cite this Entry

“Caterpillar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/caterpillar. Accessed 29 Jul. 2025.

Kids Definition

caterpillar

noun
cat·​er·​pil·​lar ˈkat-ə(r)-ˌpil-ər How to pronounce caterpillar (audio)
: the long wormlike larva of a butterfly or moth
also : any of various similar insect larvae (as of a sawfly)
Etymology

Noun

Middle English catyrpel "caterpillar," from an early French dialect word catepelose "caterpillar," literally, "hairy cat," from cate "female cat" and pelose "hairy," derived from Latin pilus "hair" — related to pile entry 5

Word Origin
On looking at a fuzzy caterpillar you might see a resemblance to another animal. One kind of caterpillar must have reminded some people of a bear and was at one time called a bear worm and later a woolly bear. In France long ago, the fuzzy caterpillars probably made some people think of little dogs. The French word for caterpillar is chenille, which comes from a Latin word for "little dog." But our word caterpillar comes from an early French dialect word, catepelose, which is made up of two words meaning "hairy cat." Pelose, meaning "hairy," was taken from Latin pilus, "hair." This Latin word is the same root that gives us our modern English word pile, meaning "a coat or surface of short furry hairs." Since many caterpillars are covered with such a coat, the name is very fitting.

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