unicorn: [13] Legends of a one-horned beast abounded in ancient times, perhaps inspired by the rhinoceros, or a sideways view of an antelope. When the early Greek translators of the Hebrew Bible came across the word re’em, which seems to have denoted a sort of wild ox, they rendered it monókerōs (literally ‘onehorn’), perhaps identifying it with the rhinoceros. The Vulgate turned this into Latin as unicornis, a noun use of an already existent Latin adjective meaning ‘one-horned’, formed from ūnus ‘one’ and cornū ‘horn’ (a relative of English horn). => horn[unicorn etymology, unicorn origin, 英语词源]