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- Dictionarypenumbra/pɪˈnʌmbrə/
noun
- 1. the partially shaded outer region of the shadow cast by an opaque object.
- 2. a peripheral or indeterminate area or group: "an immense penumbra of theory surrounds any observation"
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PENUMBRA definition: 1. a part of a shadow in which only some of the light is blocked, used especially about a shadow…. Learn more.
1. a. : a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light. b. : a shaded region surrounding the dark central portion of a sunspot. 2. : a surrounding or adjoining region in which something exists in a lesser degree : fringe.
/pəˈnʌmbrə/ /pɪˈnʌmbrə/ IPA guide. Other forms: penumbras; penumbrae. When you measure your shadow to calculate the angle of the sun in the sky, be sure to measure to the edges of your shadow, to the penumbra, the part of a shadow that is not as dark as the center.
Penumbra definition: 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.. See examples of PENUMBRA used in a sentence.
penumbra in British English. (pɪˈnʌmbrə ) noun Word forms: plural -brae (-briː ) or -bras. 1. a fringe region of half shadow resulting from the partial obstruction of light by an opaque object. 2. astronomy. the lighter and outer region of a sunspot. 3. painting. the point or area in which light and shade blend.
Jun 2, 2024 · A partially shaded area around the edges of a shadow, especially an eclipse . ( astronomy) A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot. ( figuratively) An area of uncertainty or intermediacy between two mutually exclusive states or categories.
Definition of penumbra noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
1. a. 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. b. the grayish marginal portion of a sunspot. 2. a shadowy, indefinite, or marginal area.
penumbra meaning, definition, what is penumbra: an area of slight darkness: Learn more.
The partially shaded region around the shadow of an opaque body, when the light source is larger than a point source and only part of its light is cut off (contrasted with the full shadow or umbra); ( esp. in Astronomy) that of the shadow cast by the moon on the earth in a solar eclipse, or by the earth on the moon in a lunar eclipse, resulting ...
