umbra

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umbra

 [um´brah]
the part of a shadow in which there is no light from any light source.
a sharp appearance to the edges of a structure on a radiograph.

um·bra

(ŭm'bră)
radiology An image with sharply defined margins.

umbra

(ŭm′bră) [L., shade, shadow]
The edge of the radiographic image proper.

penumbra 

1. Region of very low illumination on a dark background.
2. Zone in which the brightness varies from some illumination to zero (umbra) in the shadow cast by an opaque object intercepting light from an extensive light source. See shadow.
References in periodicals archive ?
Sports Direct has agreed to back Nike's offer for Umbro with its remaining 10%stake.
A report this week claimed Takeover Panel was examining whether rival retailers Sports Direct and JJB Sports are acting as a "concert party" to try to block Nike's takeover of Umbro.
Umbro chief executive Steve Makin said: "We will be a stronger and better business as part of Nike."
At the Helsinki Olympics in 1952, the British team wore Umbro kits and, in 1954, Roger Bannister was the first man to break the four-minute mile whilst wearing the brand.
Umbro and the Cole Haan shoe business also being offloaded by Nike are thought more likely to be snapped up by sportswear rivals than private equity.
Analysts said last week that Nike's 195p a share offer for Umbro was a good price and that it was unlikely to be beaten.
The American sportswear giant has given assurances to the Football Association over Umbro's England contract, which runs until 2014.
Umbro shares rose 28% on Thursday and were up another 9% at 167p yesterday.
Umbro also warned last month that sales of England replica shirts during the critical summer trading period had been "disappointing" and lowered sales expectations for 2008.
The Newcastle hero will receive a unique plaque for their clubhouse, tickets to a top game at Wembley Stadium and a set of Umbro training kits and equipment for their club.
KARREN Brady has revealed that Blues will have new shirt sponsors next season - to be emblazoned on a new Umbro kit.
UMBRO have revealed why they were so keen to fix up their pounds 2million shirt sponsorship deal with Hearts.