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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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a part of a shadow in which only some of the light is blocked, used especially about a shadow made during an eclipse: In a lunar eclipse, the outer shadow or penumbra is a zone where Earth blocks a portion of the sun's rays. IgorKovalchuk/iStock/Getty Images Plus/GettyImages. SMART Vocabulary: related words and phrases. Darkness & becoming dark.
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.
noun. a fringe region of half shadow resulting from the partial obstruction of light by an opaque object. astronomy the lighter and outer region of a sunspot. painting the point or area in which light and shade blend.
/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.
1. the partly lighted area surrounding the complete shadow (umbra) of a body, as the moon, during an eclipse. 2. the less dark region surrounding the dark central area of a sunspot. 3. a vague, indefinite, or borderline area.
There are five meanings listed in OED's entry for the noun penumbra. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
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.
Definition of penumbra noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
penumbra meaning, definition, what is penumbra: an area of slight darkness: Learn more.
Jun 2, 2024 · penumbra. Diagram of a large light source and a smaller occulting body, showing the relationships between the umbra, the region that receives no light from the source, so that it is fully shaded, the penumbra that receives light from only one part of the rim of the source, so that it is partly shaded, and the antumbra, that is so far from the ...
