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Definition of Umbra

  1. noun The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; -- used in contradistinction from penumbra. See Penumbra.
  2. noun The central dark portion, or nucleus, of a sun spot.
  3. noun The fainter part of a sun spot; -- now more commonly called penumbra.
  4. noun Any one of several species of sciaenoid food fishes of the genus Umbrina, especially the Mediterranean species (U. cirrhosa

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Umbra - Wikipedia on

The umbra, penumbra and antumbra are the names given to three distinct parts of a shadow, created by any light source. For a point source only the umbra is ... Umbra

Umbra was born in 1979 when childhood friends Les Mandelbaum and Paul Rowan turned a decorating dilemma into an innovative product. Graphic designer ...

Umbra | Define Umbra at

the invariable or characteristic accompaniment or companion of a person or thing . 3. Astronomy. a. the complete or perfect shadow of an opaque body, as a ...

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Umbra 3 is rendering optimization middleware that cuts down CPU and GPU processing time by optimizing critical parts of a game such as rendering, content ...

Oblivion:Umbra (sword) - UESPWiki

May 20, 2012 ... The Umbra Sword was enchanted by the ancient witch Naenra Waerr, and its sole purpose was the entrapment of souls. Used in conjunction ...

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Umbra is a flexible tactical hybrid simulation engine and framework that can integrate physical, cyber, and behavioral elements at variable fidelity in a 3D ...

umbra - Wiktionary

From Latin umbra (“shadow”). [edit] Noun. umbra (plural umbras or umbrae). A shadow. (astronomy) ... umbra (genitive umbrae); f, first declension. a shadow; a ...

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