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  1. Oxford Dictionary

    penumbra

    • IPA[pɪˈnʌmbrə]

    英式

    • 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

    • 釋義

    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 core.
    • 2. a peripheral or indeterminate area or group an immense penumbra of theory surrounds any observation
    • 更多解釋

    penumbra

    • IPA[pəˈnəmbrə]

    美式

    • n.
      the partially shaded outer region of the shadow cast by an opaque object.

    Oxford American Dictionary