Armor.
The word "shield" refers to a defensive or protective covering. It can denote both a physical object used for protection in combat and metaphorically represent any measure taken to safeguard against harm or danger.
protective covering (a lead apron)
cornea
defensive covering for the body used
The protective covering on the package was damaged. She is as protective as a mother hen.
The skin (or hide) and fur are the protective covering of a raccoon.
it's shell..
tegument!
Enamel.
Yes!
Chaps!
Larva or Medusa