1 the outer part of a SHADOW, that is less dark than the central part 半阴影

2 a dark area on the earth caused by the moon, or a dark area on the moon caused by the earth, during a PARTIAL ECLIPSE (= a time when the moon is almost exactly between the earth and the sun, or when the earth is almost exactly between the moon and the sun) （偏食时月亮投在地球或地球投在月亮上的）半影 ☞Compare umbra. 与umbra比较。 ☞picture at shadow 见shadow插图