ALL meanings of penumbra
pe·num·bra
P p - noun penumbra half-shadow 1
- noun penumbra area where sth exists to an uncertain degree 1
- noun plural penumbra Astronomy. 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). 1
- noun plural penumbra a shadowy, indefinite, or marginal area. 1
- countable noun penumbra A penumbra is an area of light shadow. 0
- noun penumbra a fringe region of half shadow resulting from the partial obstruction of light by an opaque object 0
- noun penumbra the lighter and outer region of a sunspot 0
- noun penumbra the point or area in which light and shade blend 0
- noun penumbra the partly lighted area surrounding the complete shadow (umbra) of a body, as the moon, during an eclipse 0
- noun penumbra the less dark region surrounding the dark central area of a sunspot 0
- noun penumbra a vague, indefinite, or borderline area 0