co·coon /kəˈkun/
 繭


 Co·coon n.
 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. From these the silk of commerce is prepared.
 2. Zool. (a) The case constructed by any insect to contain its larva or pupa. (b) The case of silk made by spiders to protect their eggs. (c) The egg cases of mucus, etc., made by leeches and other worms.

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 cocoon
      n : silky envelope spun by the larvae of many insects to protect
          pupas and by spiders to protect eggs
      v 1: retreat as if into a cocoon, as from an unfriendly
           environment; "Families cocoon around the T.V. set most
           evenings"; "She loves to stay at home and cocoon"
      2: wrap in or as if in a cocoon, as for protection