integument

noun

1. A shell or other outer protective layer.

   “The power of turning into an animal has this serious disadvantage that it lays you open to the chance of being wounded or even slain in your animal skin before you have the chance to put it off and scramble back into your human integument.”

   “[…] if we're moved by the book's condemnation of a world wounded by exploitation, where the drive for profit hobbles the mass of humanity, bolsters vast integuments of oppression and repression, […]”

2. An outer protective covering such as the feathers or skin of an animal, a rind or shell.

   “Sarsem became a naked young epicene in an integument of lavender scales with puffs of purple hair like pom-poms growing down his back.”

3. The outer layer of an ovule, which develops into the seed coat.

   “Her active living was suspended, but underneath, in the darkness, something was coming to pass. If only she could break through the last integuments!”