lep ‧ er /ˈlepə $ -ər/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Origin: leper 'leprosy' (13-16 centuries) , from Old French , from Late Latin lepra , from Greek , from lepein 'to remove skin' ]
1 . someone who has leprosy
2 . someone that people avoid because they have done something that people disapprove of:
They treated me as if I was a leper.