penumbra ( synonym found)
Definition of penumbra:

(n) : a partially shaded area around the edges of a shadow, especially an eclipse; a region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot
Definition of penumbra:

(n) : a partially shaded area around the edges of a shadow, especially an eclipse; a region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot
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