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caterpillar

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Caterpillar
Caterpillar (also ˈCaterpillar ˌtrack) noun [countable] trademark

a metal belt made of short connected pieces that is fastened over the wheels of a heavy vehicle to help it to move over soft ground:
    a Caterpillar tractor (=a vehicle fitted with this belt)


caterpillar
caterpillar /ˈkætəˌpɪlə $ -tərˌpɪlər/ noun [countable]
 Date: 1400-1500
 Language: Old North French
 Origin: catepelose 'hairy cat, caterpillar'

a small creature like a worm with many legs that eats leaves and that develops into a butterfly or other flying insect