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  1. Oxford Dictionary

    heliogram

    • IPA[ˈhiːlɪə(ʊ)ɡram]

    英式

    • n.
      a message sent by reflecting sunlight in flashes from a movable mirror

    • noun: heliogram, plural noun: heliograms

    • 釋義

    名詞

    • 1. a message sent by reflecting sunlight in flashes from a movable mirror the prehistoric Indian could send his heliograms considerable distances