ghos-ti- / Indo-European roots
Examples of words with the root ghos-ti-: axenic, euxenite, Gastarbeiter, guest, hospice, hospitable, hospital, host, hostile, pyroxene, xeno-.
Stranger, guest, host; properly "someone with whom one has reciprocal duties of hospitality"
1. Basic form *ghos-ti-.
a. (i) guest from Old Norse gestr, guest; (ii) Gastarbeiter from Old High German gast, guest. Both
(i) and (ii) from Germanic *gastiz;
b. host2, hostile from Latin hostis, enemy (< "stranger").
2. Compound *ghos-pot-, *ghos-po(d)-, "guest-master" one who symbolizes the relationship of reciprocal obligation (*pot-, master; see poti-) hospice, hospitable, hospital, hospitality, host1, hostage, hostel, hostler from Latin hospes (stem hospit-), host, guest, stranger.
3. Suffixed zero-grade form *ghs-en-wo-. xenia, xeno-, xenon; axenic, euxenite, pyroxene from Greek xenos, guest, host, stranger.
[Pokorny ghosti-s 453.]