um·bra /ˈʌmbrə/ [uhm-bruh]
–noun, plural -bras, -brae /-bri/ [-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. Compare penumbra (def. 1a).
b. the dark central portion of a sunspot. Compare penumbra (def. 1b).
4. a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image.
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