Note 11 — Chapter IV · OF THE REQUISITES OF A PHILOSOPHICAL LANGUAGE, AND THE PRINCIPLES OF DEFINITION.
Reading edition
"E, ex, extra, extraneus, étranger, stranger."
Another etymological example sometimes cited is the derivation of the English uncle from the Latin avus. It is scarcely possible for two words to bear fewer outward marks of relationship, yet there is but one step between them; avus, avunculus, uncle.
So pilgrim, from ager: per agrum, peragrinus, peregrinus, pellegrino, pilgrim.