Definitions
penumbra Tweet Definition of penumbra Like Definition of penumbra on Facebook
noun 
  1. A partially shaded area around the edges of a shadow, especially an eclipse.
  2. A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.
Translations: 
  • Dutch: halfschaduw (1)
  • French: pénombre (1)
  • German: Halbschatten (1), Penumbra (2)

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