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• caterpillar
  caterpillar

  noun

  the wormlike larva of a butterfly or a moth.
• Caterpillar
  Caterpillar

  a tractor intended for rough terrain, propelled by two endless belts or tracks that pass over a number of wheels.

caterpillar

¹ American  

[kat-uh-pil-er, kat-er-] / ˈkæt əˌpɪl ər, ˈkæt ər- /

noun

1. the wormlike larva of a butterfly or a moth.

2. a person who preys on others; extortioner.

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Caterpillar ² American  

[kat-uh-pil-er, kat-er-] / ˈkæt əˌpɪl ər, ˈkæt ər- /

Trademark.

1. a tractor intended for rough terrain, propelled by two endless belts or tracks that pass over a number of wheels.

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caterpillar ¹ British  

/ ˈkætəˌpɪlə /

noun

1. the wormlike larva of butterflies and moths, having numerous pairs of legs and powerful biting jaws. It may be brightly coloured, hairy, or spiny

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Caterpillar ² British  

/ ˈkætəˌpɪlə /

noun

1. an endless track, driven by sprockets or wheels, used to propel a heavy vehicle and enable it to cross soft or uneven ground

2. a vehicle, such as a tractor, tank, bulldozer, etc, driven by such tracks

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caterpillar Scientific  

/ kăt′ər-pĭl′ər /

1. The wormlike larva of a butterfly or moth. Caterpillars have thirteen body segments, with three pairs of stubby legs on the thorax and several on the abdomen, six eyes on each side of the head, and short antennae. Caterpillars feed mostly on foliage and are usually brightly colored. Many have poisonous spines.

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Etymology

Origin of caterpillar

1400–50; late Middle English catyrpel, probably alteration of an Old North French variant of Old French chatepelose, equivalent to chate cat ( def. ) + pelose hairy (≪ Latin pilōsus; see pilose); -yr probably by association with cater tomcat ( see caterwaul); final -er probably by association with piller despoiler ( see pillage, -er ¹); cf. chenille

Explanation

A caterpillar is a fuzzy, worm-like insect that transforms into a butterfly or a moth. Many caterpillars are striped and colorful. A caterpillar is officially the larva, or immature form, of a flying insect — generally, a butterfly. Because caterpillars are growing rapidly, they tend to eat constantly, and for this reason they're considered pests by gardeners and farmers. The word caterpillar comes from the Old North French caterpilose, literally "shaggy cat," from the Late Latin catta, "cat," and pilosus, "hairy" or "shaggy."

Example Sentences

Butterfly Conservation said was most likely caused by ermine moth caterpillars, which feed inside the webs and "are the definition of a hungry caterpillar".

From BBC • May 13, 2026

A delay of just a few days sharply lowers caterpillar survival and cuts feeding damage to the trees by about 55 percent.

From Science Daily • May 5, 2026

This year also featured some of the most memorable art in the festival’s history, with the hippos running “Corporate Headquarters” and the transformation of Poetic Kinetics’ Coachella caterpillar into a butterfly.

From Los Angeles Times • Apr. 6, 2026

Trefry likened this awkward time of life to the stage in a butterfly’s development when a caterpillar disappears inside a chrysalis and dissolves into goo before reforming into something entirely new.

From Salon • Nov. 24, 2025

A contemporary of Leeuwenhoek’s, Jan Swammerdam, showed that butterflies, which had been regarded as new creatures born out of the pupa, were already present within the caterpillar: their organs could be identified by dissection.

From "The Invention of Science" by David Wootton