Penumbra

The SUNSPOT area that may surround the darker UMBRA or umbrae. It consists of linear bright and dark elements radial from the sunspot umbra.

Penumbra

Means, literally, 'dim light'. It most often refers to the outer shadow cast during eclipses, and defines the region of shadow which gives rise to a partial eclipse. The lighter area surrounding the central region of a sunspot.

Penumbra

• (n.) The part of a picture where the shade imperceptibly blends with the light. • (n.) 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. • (n.) An incomplete or partial ...
Found on http://thinkexist.com/dictionary/meaning/penumbra/

Penumbra

(1). The lighter part of a sunspot. (2). The area of partial shadow either side of the main umbra cone of shadow cast by the Earth.
Found on http://www.encyclo.co.uk/local/20448

penumbra

(from Latin paene, `almost`; umbra, `shadow`), in astronomy, the outer part of a conical shadow, cast by a celestial body, where the light from the ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/p/40

penumbra

(from the article `Sun`)
Found on http://www.britannica.com/eb/a-z/p/40

penumbra

(pә-num´brә) the part of a shadow in which there is a small amount of illumination from a light source. blurring at the edges of a structure on a radiograph.
Found on http://www.encyclo.co.uk/local/21001

penumbra

1. An incomplete or partial shadow. ... 2. <astronomy> 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. ... The faint shade surrounding the dark central portion of a solar spot is...
Found on http://www.encyclo.co.uk/local/20973

penumbra

noun a fringe region of partial shadow around an umbra
Found on https://www.encyclo.co.uk/local/20974

Penumbra

[medicine] In pathology and anatomy the penumbra is the area surrounding an ischemic event such as an ischemic, thrombotic or embolic stroke. Immediately following the event, blood flow and therefore oxygen transport is reduced locally, leading to hypoxia of the cells near the location of the original insult. This can lead to hypoxic cell d...
Found on http://en.wikipedia.org/wiki/Penumbra_(medicine)

Penumbra

Pe·num'bra noun [ New Latin , from Latin paene almost + umbra shade.] 1. An incomplete or partial shadow. 2. (Astron.) 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 betw...
Found on http://www.encyclo.co.uk/webster/P/50

Penumbra

A penumbra is a partly shaded region around the shadow of an opaque body. The term is especially applied to describe the partly shaded region around a total eclipse of the sun or moon.
Found on http://www.probertencyclopaedia.com/browse/GP.HTM

Penumbra

Literally partial shadow; the partially lighted area around any completely darkened area (umbra) of
Found on http://www.superglossary.com/Glossary/Science/Astrology/

penumbra

penumbra (pinŭm'bru) : see eclipse; sunspots.
Found on http://www.infoplease.com/ce6/sci/A0917330.html

penumbra

penumbra (s), penumbrae (pl), penumbral 1. In astronomy, a partial outer shadow that is lighter than the darker inner shadow (umbra); that is, the area between complete darkness and complete light in an eclipse. 2. In astronomy, a grayish area surrounding the dark center of a sunspot. 3. An indistinct area, especially a state in which some...
Found on http://www.wordinfo.info/words/index/info/view_unit/1603/

penumbra

Region of partial shade between the totally dark part (umbra) of a shadow and the fully illuminated region outside. It occurs when a source of light is only partially obscured by a shadow-casting object. The darkness of a penumbra varies gradually from total darkness at one edge to full brightness at the other. In astronomy, a penumbra is a reg...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0030337.html

Penumbra

The area of partial illumination surrounding the darkest part of a shadow caused by an eclipse.
Found on http://www.seasky.org/astronomy/astronomy-glossary.html

penumbra

the larger shadow cast by the Moon during a solar eclipse.
Found on http://www.kidseclipse.com/pages/glossary.htm

Penumbra

The lighter part of a shadow found on the shadow's edge.
Found on http://www.kidsastronomy.com/dictionary.htm

Penumbra

The name given to the shadow cast by a celestial object that only blocks a portion of the light.
Found on http://www.moonconnection.com/moon-glossary.phtml

penumbra

The outer filamentary region of a sunspot.
Found on http://www.solarviews.com/eng/terms.htm

Penumbra

The transition region between the darkest shadow and full brightness. Only part of the light from the source reaches this region.
Found on http://www.diracdelta.co.uk/science/source/p/e/penumbra/source.html

penumbra

Type: Term Pronunciation: pe-nŭm′bră Definitions: 1. The region of partial illumination or radiation caused by light or x-rays not originating from a point source; also called geometric unsharpness.
Found on http://www.medilexicon.com/medicaldictionary.php?t=66731

penumbra

[n] - a fringe region of partial shadow around an umbra
Found on http://www.webdictionary.co.uk/definition.php?query=penumbra

penumbra

• The lighter, outer shadow of a double-shadow effect produced by a large, unfocused source of light shining on an interfering opaque object. A penumbral eclipse is one in which the eclipsed object passes through the penumbral shadow. • The lighter area, marked by radial filaments, that ...
Found on http://www.daviddarling.info/encyclopedia/P/penumbra.html
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