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    penumbra
    /pɪˈnʌmbrə/

    noun

    • 1. the partially shaded outer region of the shadow cast by an opaque object.
    • 2. a peripheral or indeterminate area or group: "an immense penumbra of theory surrounds any observation"

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      Penumbra, Inc., headquartered in Alameda, California, is a...

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  3. www.merriam-webster.com › dictionary › penumbraPenumbra Definition & Meaning - Merriam-Webster

    Penumbra is a noun that means a space of partial illumination, a shaded region, or a body of rights implied from other rights. Learn more about its etymology, synonyms, examples, and related words.

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  5. dictionary.cambridge.org › dictionary › englishPENUMBRA | English meaning - Cambridge Dictionary

    PENUMBRA definition: 1. a part of a shadow in which only some of the light is blocked, used especially about a shadow…. Learn more.

  6. en.wikipedia.org › wiki › Umbra,_penumbra_and_antumbraUmbra, penumbra and antumbra - Wikipedia

    The penumbra (from the Latin paene "almost, nearly" and umbra "shadow") is the region in which only a portion of the light source is obscured by the occluding body. An observer in the penumbra experiences a partial eclipse.

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    • Eclipse Shadow: What Is the Penumbra?
    • Penumbra Shadow | Facts, Information, History, Types, How Dark & When
    • Umbra, penumbra y antumbra - Wikipedia, la enciclopedia libre

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  9. www.dictionary.com › browse › penumbraPENUMBRA Definition & Meaning | Dictionary.com

    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.

  10. dictionary.cambridge.org › us › dictionaryPENUMBRA | definition in the Cambridge English Dictionary

    PENUMBRA meaning: 1. a part of a shadow in which only some of the light is blocked, used especially about a shadow…. Learn more.

  11. www.timeanddate.com › eclipse › penumbra-shadowEclipse Shadow: What Is the Penumbra? - timeanddate.com

    Learn about the penumbra, the lighter outer part of a shadow that causes partial eclipses of the Sun and the Moon. Find out how the penumbra's size, shape, and darkness vary depending on the distance and angle of the eclipsing object.