xeno-, xen-, -xenic, -xenism, -xenist, -xenous, -xeny
(Greek: foreign, foreigner; alien; different; extraneous; strange, stranger; and by extension, guest)
The "x" in xeno- is pronounced "z"; "zeno". Greeks are said to have considered any stranger a "guest" and modern Greek includes xenodocheion a "guest house" or "house for guests" or its modern version of "hotel".
The etymological meaning usually denotes some aspect of a relationship involving guests or visitors of some kind.