aurora
/ɔ:ˈrɔ:rə; ɔ`rɔrə/ n
1 au,rora bore`alis / bɔ:rɪˈeɪlɪs; ˌbɔrɪ`elɪs/ (also the northern lights) bands of coloured light, mainly red and green, seen in the sky at night near the North Pole and caused by electrical radiation 北极光（在北极上空夜晚可见由电辐射产生的带状彩色光, 以红绿为主）.
2 au,rora au`stralis/ ɔˈstreɪlɪs; ɔs`trelɪs/ similar lights seen in the southern hemisphere 南极光（在南半球可见的类似的光）.