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A Writer's Dictionary:

penumbrae Definition


Dictionary Home » Words Starting with P » penstemon ... peppiest » penumbrae


penumbra
noun penumbrae, penumbras
    1. The lighter outer shadow that surrounds the dark central shadow produced by a large unfocused light-source shining on an opaque object.
    2. astron.
      The lighter area around the edge of a sunspot.
Derivative: penumbral
adj
    Etymology: 17c: Latin, from paene almost + umbra shadow.



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