xenogamy (n.)

word-forming element meaning "marriage" in anthropology and "fertilization" in biology, from Greek -gamia, from gamos "marriage" (see gamete).

before vowels, xen-, word-forming element meaning "strange, foreign; stranger, foreigner," from Greek xenos "a guest, stranger, foreigner, refugee, guest-friend, one entitled to hospitality," cognate with Latin hostis, from PIE root *ghos-ti- "stranger, guest, host." "The term was politely used of any one whose name was unknown" [Liddell & Scott].