convertible (adj.)youdaoicibaDictYouDict[convertible 词源字典]
late 14c., from Old French convertible (13c.), from Late Latin convertibilis "changeable," from Latin convertere (see convert (v.)). The noun is recorded from 1610s; meaning "automobile with a fold-down top" is from 1916.[convertible etymology, convertible origin, 英语词源]