If you look back to the ancient Greek terms that underlie the word xenophobia, you'll discover that xenophobic individuals are literally "stranger fearing." Xenophobia, that elegant-sounding name for an aversion to persons unfamiliar, ultimately derives from two Greek terms: xenos, which can be translated as either "stranger" or "guest," and phobos, which means either "fear" or "flight." Phobos is the ultimate source of all English -phobia terms, but many of those were actually coined in English or New Latin using the combining form -phobia. Xenophobia itself came to us by way of New Latin and first appeared in print in English in the late 19th century.