Dictionaryum•braPronunciation: (um'bru), [key] —n., —pl. -bras, -braePronunciation: (-brē). [key] 1. shade; shadow. 2. the invariable or characteristic accompaniment or companion of a person or thing. 3. Astron. 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. Cf. penumbra (def. 1a). b. the dark central portion of a sunspot. Cf. penumbra (def. 1b). 4. 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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