(kat′ər·pil′ər) noun
1. The larva of a butterfly or moth (order Lepidoptera), or of certain other insects, as the sawfly.
2. Something resembling a caterpillar or its system of locomotion, as a car fitted with supplementary wheels or a device on the principle of the endless chain. [<AF catepelose hairy cat <L catta cat + pilosus <pilum hair]
CATERPILLAR
a. Swallowtail butterfly. b. Mourning cloak butterfly. c. Emperor moth. d. Puss moth. e. Eyed hawk moth. ƒ. Great peacock moth. g. Pale tussock moth.

(kat′ər·pil′ər) noun
A tractor whose driving wheels gear with self-laid, wide metal belts whereby its weight is distributed over a large area, permitting the tractor to move over soft or rough terrain: a trade name.