1. (noun)caterpillar a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth Synonyms: cat
2. (noun)Caterpillar, cat a large tracked vehicle that is propelled by two endless metal belts; frequently used for moving earth in construction and farm work Synonyms: computed tomography, computed axial tomography, cat-o'-nine-tails, qat, computerized axial tomography, big cat, cat, guy, hombre, khat, computerized tomography, bozo, true cat, quat, kat