Part of speech: noun

The envelop in which larvae, as of silkworms, are enclosed in the chrysalis state.

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Usage examples "cocoon":

  1. These are late arrivals that have come from the cocoon upon a cold world and are doing their best to make good in it. - "Old Plymouth Trails", Winthrop Packard.
  2. It is the ground, it is the stretch of sand which they are so assiduously exploring; what they are waiting for is the arrival of some female, who bursting the cocoon, may appear from one moment to the next, issuing all dusty from the ground. - "More Hunting Wasps", J. Henri Fabre.
  3. It was of a well- intentioned beetle who fattened a nice green caterpillar for its family's thanksgiving dinner, and the thing went and spun itself into a cocoon the night before! - "People of the Whirlpool", Mabel Osgood Wright.