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1. Oxford Dictionary

   noctilucent cloud

   • IPA[ˌnɒktɪˈluːs(ə)nt]

   英式

   • n.
     a luminous cloud of a kind occasionally seen at night in summer in high latitudes, at the altitude of the mesopause

   • noun: noctilucent cloud, plural noun: noctilucent clouds

2. • 釋義

   n.

   名詞

   • 1. a luminous cloud of a kind occasionally seen at night in summer in high latitudes, at the altitude of the mesopause he estimated the height of the noctilucent clouds he saw at 80 to 100 km
3. • 更多解釋

   noctilucent cloud

   • IPA[näktəˌlo͞os(ə)nt ˈkloud]

   美式

   • n.
     a high-altitude cloud that is luminous at night, especially in summer in high latitudes: he estimated the height of the noctilucent clouds he saw at 80 to 100 km

   Oxford American Dictionary