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/pəˈnʌm.bɹə/ · noun
A partially shaded area around the edges of a shadow, especially an eclipse..
[A]ny penumbral fringe that may be detected cannot be well distinguished from the effects of the true penumbræ; […]
The other places see the penumbra of the moon's shadow fall on the earth, so the eclipse is partial, and part of the sun's disc is still visible.
In the boiling temperature of 119 ° F – the hottest they had experienced so far – they watched as the penumbra of Venus blurred its outline at the precise moment the disc crossed the sun.
The part of the moon that remains in the penumbra receives some direct sunlight, and the glare is usually great enough to prevent your seeing the faint coppery glow of the part of the moon in the umbra.
The atmosphere was very clear, evidenced by the steadiness with which the mottling of the sun’s surface and the penumbræ of several spots were visible.
The velocities found in the penumbræ of spots generally increase with the distance from the centre of radiation, the motion being zero at some point in the umbra, and accelerating outwards.
These firms or businesses are not illegal in the strict sense, but there is a shadowy penumbra within which they live, and it is often convenient for the government to look the other way.
[…] God chose to descend into the realm of human imperfection, where the light of truth is spare and must exist in the penumbra of partial knowledge mixed with partial ignorance.
Use penumbra when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Penumbra means A partially shaded area around the edges of a shadow, especially an eclipse..
Common synonyms include grey area, periphery, outskirt.
The opposite depends on the specific sense.
[A]ny penumbral fringe that may be detected cannot be well distinguished from the effects of the true penumbræ; […]
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