Umbra (noun)
umbra [uhm-bruh]

noun, plural umbras, umbrae [uhm-bree]
1. shade; shadow.
2. the invariable or characteristic accompaniment or companion of a person or thing.
3. Astronomy.
a. the complete or perfect shadow of an opaque body, as a planet, where the direct light from the source of illumination is completely cut off.
b. the dark central portion of a sunspot.
4. a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image.

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Origin: 1590-1600; < Latin: shade, shadow

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