vanish: [14] To vanish is etymologically to ‘become empty’. The word comes via Old French esvanir ‘disappear’ from Vulgar Latin *exvānīre, a variant of Latin ēvānēscere ‘disappear’ (source also of English evanescent [18]). This was a compound verb formed from the prefix ex- ‘out’ and vānus ‘empty’ (source of English vain, vanity, vaunt, etc). => evanescent, vain, vanity, vaunt[vanish etymology, vanish origin, 英语词源]