retro (adj.)youdaoicibaDictYouDict[retro 词源字典]
1974, from French rétro (1973), supposedly first used of a revival c. 1968 of Eva Peron-inspired fashions and short for rétrograde (see retrograde). There is an isolated use in English from 1768, and the word apparently was used in 19c. French as a term in billiards. As a noun, short for retro-rocket (1948) from 1961.[retro etymology, retro origin, 英语词源]