Co-cōōn', n.

n. [Fr. cocon, diminutive of coque, shell of eggs and insects, from Lat. concha, muscle-shell.]

1. An oblong case in which the silkworm lies in its chrysalis state. It is formed of threads of silk spun by the worm just before leaving the larval state, and from these the silk of commerce is prepared.
2. The case constructed by any insect to contain its larve.