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umbra

   Also found in: Dictionary/thesaurus, Medical, Legal, Acronyms, Wikipedia, Hutchinson 0.03 sec.
umbra: see eclipse eclipse (ēklĭps`, ĭ–) [Gr.
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; sunspots sunspots, dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The Chinese recorded dark features on the sun seen with the naked eye in 28 B.C.
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.
umbra
1. a region of complete shadow resulting from the total obstruction of light by an opaque object, esp the shadow cast by the moon onto the earth during a solar eclipse
2. the darker inner region of a sunspot

umbra [′əm·brə]
(astronomy)
The dark, central region of a sunspot.
(optics)
That portion of a shadow which is screened from light rays emanating from any part of an extended source.


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99) By the mid-1960s, the magazine began to publish the material of younger writers (such as Umbra founder Tom Dent and Harlem Writers Guild member, Jean Carey Bond) more frequently--figures who anticipated and later contributed to the Black Arts Movement.
It has been a most fruitful exercise for me to accompany this gifted writer over the year, to be allowed to "follow the star" with him and to do it, to borrow from the book's title, sub umbra Dei--under the shadow of God.
During the 2001 MLA Annual Convention (New Orleans) special session "In the Wind of History," which I organized, several writers, scholars, and friends had the opportunity to discuss the life and work of Tom Dent--poet, playwright, cultural nationalist, and co-founder of the 1960"s Umbra poetry workshop in New York's Lower East Side.
 
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