| a combining form meaning “alien,” “strange,” “guest,” used in the formation of compound words: xenogamy, xenolith. |

| xeno- or xen- pref.
[New Latin, from Greek, from xenos, stranger; see ghos-ti- in Indo-European roots.] |
xeno- or xen-
pref.
Stranger; foreigner: xenophobia.
Strange; foreign; different: xenophthalmia.