keratitis

The story

1. French · derived from-ite“-itis”
2. Ancient Greek · derived fromκέρᾰτ-
3. French · borrowed fromkératite
4. English todaykeratitis

Probably borrowed from French kératite, from Ancient Greek κέρᾰτ- (kérăt-), κέρας (kéras, “horn”) + French -ite (“-itis”); see kerato-.