Language: Penumbraebrae

Plural of penumbra. The lighter outer regions of a shadow where the light source is only partially obscured, surrounding the darker central umbra. The word is commonly used in astronomy. In art it is rarely used as blending of light and shade. It is the play of light and shade.

Synonyms: Partial shadow, fringe region, shades region. 

Derived from Latin paene (almost) and umbra (shadow)

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