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silkworm

[silk-wurm] /ˈsɪlkˌwɜrm/
noun
1.
the larva of the Chinese silkworm moth, Bombyx mori, which spins a cocoon of commercially valuable silk.
2.
the larva of any of several moths of the family Saturniidae, which spins a silken cocoon.
Origin
1000
before 1000; Middle English sylkewyrme, Old English seolcwyrm. See silk, worm
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for silkworm

silkworm

/ˈsɪlkˌwɜːm/
noun
1.
the larva of the Chinese moth Bombyx mori, that feeds on the leaves of the mulberry tree: widely cultivated as a source of silk
2.
any of various similar or related larvae
3.
silkworm moth, the moth of any of these larvae
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for silkworm
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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