the outer covering of an animal

A relationship or connection between two things based on co-occurrence or pattern of change, a reciprocal relation between two or more things, a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other

The state or property of being vulnerable; vulnerableness, uncountable Susceptibility to attack or injury; the state or condition of being weak or poorly defended, countable a specific weakness in the protections or defences surrounding someone or something.

(tennis) a score consisting of winning a game when your opponent was serving