Leper a person having leprosy; a person to be shunned or ostracized, as because of the danger of moral contamination. Here, it is a nickname for the quiet, aloof Elwin Lepellier.
seigneurs lord (French) a lord or noble, specifically, the lord of a fee or manor. Here, the term characterizes the superiority Gene and Finny feel when they jump from the tree and the others do not.
