This section is from the book "The Home Cyclopedia Of General Information", by Charles Morris. Also available from Amazon: Home Cyclopedia of Necessary Knowledge.
[Fr.] The case spun by insects to cover them, especially the oblong case of the silkworm in its chrysalis state, which is formed of threads of silk spun by the insect in its larval state, and from which the silk of commerce is prepared.
 
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