nimbus (n.)youdaoicibaDictYouDict[nimbus 词源字典]
1610s, "bright cloud surrounding a god," from Latin nimbus "cloud," perhaps related to nebula "cloud, mist" (see nebula). Meaning "halo" is first recorded c. 1730. Meteorological sense of "a rain cloud" is from 1803.[nimbus etymology, nimbus origin, 英语词源]