Any of various caterpillars of moths that produce silk cocoons, especially Bombyx mori, the source of most commercial silk.
User Defined Definitions
"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"
"larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon"