nosocomial

Learned borrowing from Late Latin nosocomīum (“hospital, infirmary”) + English -al (suffix meaning ‘of or pertaining to’ forming adjectives). Nosocomīum is borrowed from Ancient Greek νοσοκομεῖον (nosokomeîon, “hospital, infirmary”), from νοσοκομέω (nosokoméō, “to tend the sick”) + -εῖον (-eîon, suffix forming nouns denoting places); νοσοκομέω (nosokoméō) is from νόσος (nósos, “disease, illness, sickness”) (further etymology uncertain) + κομέω (koméō, “to take care of, look after, tend”) (from Proto-Indo-European *kem(H)- (“to be tired; to exert oneself”)).

来源：wiktionary