1. An exterior, or hard covering that supports and protects the outer structures of creatures: "Examples of exoskeletons include insects, lobsters, crabs, shrimps, barnacles, etc."
2. A device that humans can wear for greater strength: "The exoskeleton works on a principal of muscle-actuation."

"Built into exoskeletons are a number of pressure points, which, when triggered by even the slightest contact with a person's body, reinforce the movement of the arms, hands, feet, and legs similar to the power steering in cars which make natural rotational movements by the arms and hands with a car's steering wheel much easier."