8 letters · 17 points in Scrabble
noun 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
noun larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon
originFrom Middle English silkwirm, from Old English seolcwyrm (“silkworm”), equivalent to silk + worm.
Etymology from Wiktionary, CC BY-SA 3.0