- the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off.Compare umbra (def. 3a).
- the grayish marginal portion of a sunspot.Compare umbra (def. 3b).
Origin of penumbra
OTHER WORDS FROM penumbrape·num·bral, pe·num·brous, adjective
Words nearby penumbra
How to use penumbra in a sentence
Yes, both injuries are experienced during a traumatic event; however, the psychological penumbra is very different.Study Says Half of Jailed NYC Teens Have History of Brain Injury|Dr. Anand Veeravagu, MD, Tej Azad|April 22, 2014|DAILY BEAST
In person, Waltz is equally charming, but without the penumbra of menace that comes with having Nazi goons just outside the door.Tarantino's Glorious Nazi|Paul Cullum|August 16, 2009|DAILY BEAST
It formed, as it were, a penumbra of fine shrilling, and could be heard for many streets in advance.The Dragon Painter|Mary McNeil Fenollosa
The penumbra will last quite a long time yet, but it will gradually get fainter and fainter.Pharaoh's Broker|Ellsworth Douglass
And the concert ended, and soon they were alone together in the flower-filled, fragrant penumbra of the moving carriage.The Devourers|Annie Vivanti Chartres
He has touched even the dark penumbra of treason; that could not but risk the sum of his other strivings.The Posthumous Works of Thomas De Quincey, Vol. 1 (2 vols)|Thomas De Quincey
This portion was the kernel of the inheritance, surrounded by a wide penumbra of more feeble light and fewer privileges.The Expositor's Bible: The Book of Joshua|William Garden Blaikie