silkworm: the commercially bred hairless white caterpillar of the domestic silkworm moth which spins a cocoon that can be processed to yield silk fiber; the principal source of commercial silk
caterpillar: a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth
measuring worm: small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae