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Meaning of umbra

um•bra

Pronunciation: (um'bru), [key]
— pl. -bras, -brae
  1. shade; shadow.
  2. the invariable or characteristic accompaniment or companion of a person or thing.
    1. 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. Cf.penumbra(def. 1a).
    2. the dark central portion of a sunspot. Cf.penumbra(def. 1b).
  3. a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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