Penumbra meaning

pĭ-nŭmbrə
A partial shadow, as in an eclipse, between regions of complete shadow and complete illumination.
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The definition of a penumbra is the lighted area around the shadow of a planet or moon during an eclipse.

An example of the penumbra is the outer lighted area surrounding the shadow of the moon which is created during an eclipse.

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The partly lighted area surrounding the complete shadow (umbra) of a body, as the moon, during an eclipse.
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A vague, indefinite, or borderline area.
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(figuratively) An area of uncertainly or intermediacy between two mutually exclusive states or categories.
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The diffuse outer part of a sunspot.
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An area in which something exists to a lesser or uncertain degree.
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A partial shadow between regions of full shadow (the umbra) and full illumination, especially as cast by Earth, the Moon, or another body during an eclipse. During a partial lunar eclipse, a portion of the Moon's disk remains within the penumbra of Earth's shadow while the rest is darkened by the umbra.
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A partially shaded area around the edges of a shadow, especially an eclipse.
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An outlying surrounding region; a periphery.
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The less dark region surrounding the dark central area of a sunspot.
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The grayish outer part of a sunspot.
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(astronomy) 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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(figuratively) An area that lies on the edge of something; a fringe.
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Something related to, connected to, and implied by, the existence of something else that is necessary for the second thing to be full and complete in its essential aspects.
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(medicine) (in "ischaemic penumbra", after a stroke) A region of the brain that has lost only some of its blood supply, and retains structural integrity but has lost function.
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Origin of penumbra

  • New Latin pēnumbra Latin paene almost Latin umbra shadow

    From American Heritage Dictionary of the English Language, 5th Edition

  • From New Latin penumbra, from Latin paene (“almost") + umbra (“shadow").

    From Wiktionary