What does penumbra mean?

Definitions for penumbra
pɪˈnʌm brəpenum·bra

Here are all the possible meanings and translations of the word penumbra.

Princeton's WordNet

  1. penumbranoun

    a fringe region of partial shadow around an umbra


  1. penumbranoun

    A partially shaded area around the edges of a shadow, especially an eclipse.

  2. penumbranoun

    A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.

  3. penumbranoun

    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.

  4. penumbranoun

    (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.

  5. Etymology: From paene + umbra.

Samuel Johnson's Dictionary

  1. Penumbranoun

    An imperfect shadow.

    Etymology: pene and umbra, Latin.

    The breadth of this image answered to the sun’s diameter, and was about two inches and the eighth part of an inch, including the penumbra. Newton.

Webster Dictionary

  1. Penumbranoun

    an incomplete or partial shadow

  2. Penumbranoun

    the shadow cast, in an eclipse, where the light is partly, but not wholly, cut off by the intervening body; the space of partial illumination between the umbra, or perfect shadow, on all sides, and the full light

  3. Penumbranoun

    the part of a picture where the shade imperceptibly blends with the light

  4. Etymology: [NL., fr. L. paene almost + umbra shade.]

Chambers 20th Century Dictionary

  1. Penumbra

    pē-num′bra, n. a partial or lighter shadow round the perfect or darker shadow of an eclipse: the part of a picture where the light and shade blend into each other.—adjs. Penum′bral, Penum′brous. [L. pæne, almost, umbra, shade.]

The Nuttall Encyclopedia

  1. Penumbra

    the name given to the partial shadow on the rim of the total shadow of an eclipse, also to the margin of the light and shade of a picture.


  1. Penumbra

    Penumbra, Inc. develops clinically beneficial products that help patients suffering from stroke and other neurovascular diseases. It offers Penumbra System, an ischemic stroke device platform; Penumbra Coil 400 that allows rapid packing of aneurysms; 5MAX ACE, a clot extraction device for engaging and removing blood clots causing an acute ischemic stroke; and Neuron System, a family of access catheters to enable therapies to be delivered to blood vessels high up in the brain. The company sells its products in North and South America, Europe, Australia, and Asia. Penumbra, Inc. was founded in 2004 and is headquartered in Alameda, California.

Dictionary of Nautical Terms

  1. penumbra

    The lighter shade which surrounds the dark shadow of the earth in an eclipse of the moon. Also, the light shade which usually encircles the black spots upon the sun's disc.

Suggested Resources

  1. penumbra

    Song lyrics by penumbra -- Explore a large variety of song lyrics performed by penumbra on the Lyrics.com website.

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How to pronounce penumbra?

How to say penumbra in sign language?


  1. Chaldean Numerology

    The numerical value of penumbra in Chaldean Numerology is: 6

  2. Pythagorean Numerology

    The numerical value of penumbra in Pythagorean Numerology is: 9

Examples of penumbra in a Sentence

  1. Jenna Ellis:

    So then we get to Lawrence v. Texas, which was a Texas law criminalizing sodomy, and judicial activism ignored the immorality of homosexuality and created this fabricated right to privacy that was in the penumbra of the Constitution and determined that homosexuality is within that right to privacy in the penumbra of the Constitution. And the Supreme Court with judicial activist motivations overturn that law.

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    lacking orderly continuity
    • A. profound
    • B. abrupt
    • C. disjointed
    • D. blistering

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