umbra
1.
The invariable or characteristic accompaniment or companion of a person or thing.
2.
Shade; shadow.
3.
In astronomy, the complete shadow of an opaque body, as a planet, where the direct light from the source of illumination is completely cut off.
4.
A phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image.
via dictionary.com
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