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1. Oxford American Dictionary

   penumbra

   • IPA[pəˈnəmbrə]

   美式

   • n.
     the partially shaded outer region of the shadow cast by an opaque object.；the shadow cast by the earth or moon over an area experiencing a partial eclipse.

   • noun: penumbra, plural noun: penumbrae

2. • 釋義

   n.

   名詞

   • 1. the partially shaded outer region of the shadow cast by an opaque object.
   • ▪ the shadow cast by the earth or moon over an area experiencing a partial eclipse.
   • ▪ the less dark outer part of a sunspot, surrounding the dark core.