A partial shadow, as with an eclipse, between regions of full shadow and full lighting. See Synonyms at color.
The grayish outer section of a sunspot.
a place in which one thing exists to a smaller or uncertain degree: "1st Amendment has a penumbra in which privacy is protected from governmental intrusion” ( Joseph A. Califano, Jr.)
An outlying surrounding region; a periphery: "Downtown Chicago as well as its penumbra additionally stand rejuvenated” ( John McCormick).
A partially shaded area around the sides of a shadow, particularly an eclipse.
a spot all over edge of a sunspot, darker than the sun's area but lighter as compared to center of sunspot.
An area of uncertainly or intermediacy between two mutually unique states or categories.
An area that lies in the side of something; a fringe.
anything regarding, attached to, and implied by, the existence of another thing that is essential for the next thing becoming full and total in its essential aspects.
(in "ischaemic penumbra", after a stroke) a spot associated with mind that has lost only some of its blood circulation, and retains structural integrity but has actually lost function.
An incomplete or partial shadow.
The shadow cast, in an eclipse, in which the light is partly, however completely, cut-off because of the intervening human body; the room of partial illumination amongst the umbra, or perfect shadow, on all sides, in addition to complete light.
The part of a photo where the color imperceptibly blends aided by the light.
The limited shadow involving the full light and complete shadow due to an opaque human body intercepting an integral part of the light from a luminous body.
The gray fringing edge which encompasses the dark umbra or nucleus of a sun-spot.
In painting, the boundary of tone and light, in which the one blends because of the other, the gradation becoming almost imperceptible.
A surrounding edge or edge, as in the distribution of metamorphic effects created by an igneous mass.