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n. pl. pe·num·bras or pe·num·brae (-brē)
1. A partial shadow, as in an eclipse, between regions of complete shadow and complete illumination.
2. The diffuse outer part of a sunspot.
3. An area in which something exists to a lesser or uncertain degree: "The First Amendment has a penumbra where privacy is protected from governmental intrusion" (Joseph A. Califano, Jr.).
4. An outlying surrounding region; a periphery: "Downtown Chicago and its penumbra also stand rejuvenated" (John McCormick).

[New Latin pēnumbra : Latin paene, almost + Latin umbra, shadow.]

pe·num′bral, pe·num′brous adj.
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Adj.1.penumbral - of or pertaining to the region of partial shadow around an umbra
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References in classic literature ?
He sees penumbral visions of himself titubating fantastically through days and nights of space and stars.
According to PAGASA, the phases of the eclipse happened accordingly: Penumbral eclipse at 6:49 pm Partial eclipse at 7:48 pm Greatest eclipse at 9:29 pm Partial eclipse ended at 11:11 pm and the Penumbral eclipse ended at 12:09 am.
The total eclipse would end at 19-08 PST, partial eclipse at 20-11 PST, and penumbral eclipse at 21-08 PST.
Meanwhile, according to the Climate Data Processing Centre at PMD, the penumbral eclipse will begin at 15:51 PST, partial eclipse at 16:48, followed by total eclipse at 17:52 and the greatest eclipse at 18:31 PST.
Wednesday, when the moon starts its passage into the earth's shadow called the penumbral eclipse phase.
Penumbral eclipse was said to begin at 15:51 hours Pakistan Standard Time (PST), Partial Eclipse at 16:48 hours, Total Eclipse at 17:52 hours, Greatest Eclipse at 18:31 hours whereas Total eclipse will end at 19:08 hours (PST), Partial eclipse ends at 20:11 and Penumbral eclipse will end at 21:08 hours.
Penumbral eclipse was said to begin at 15: 51 hours Pakistan Standard Time (PST), Partial Eclipse at 16: 48 hours, Total Eclipse at 17: 52 hours, Greatest Eclipse at 18: 31 hours whereas Total eclipse will end at 19: 08 hours (PST), Partial eclipse ends at 20: 11 and Penumbral eclipse will end at 21: 08 hours.
Penumbral shading becomes deeper as the Moon moves toward the first partial phase, which begins when the Moon's leading edge enters Earth's umbra.
In New York the penumbral eclipse will start at 5:51 a.
Just recently we had a Black Moon and before that was a Harvest Moon that happened at the same time as a penumbral eclipse.
There are two types of shadow that can be cast by the Earth: penumbral and umbral.
This celestial phenomenon called partial penumbral eclipse of the moon, will be best visible with binoculars or telescopes.