Etymology
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silkworm (n.)

Old English seolcwyrm; see silk + worm (n.).

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Definitions of silkworm

silkworm (n.)
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;
silkworm (n.)
larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon;
Synonyms: giant silkworm / wild wilkworm
From wordnet.princeton.edu