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umbra
(redirected from umbras)

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
umbra [um´brah]
the part of a shadow in which there is no light from any light source.
a sharp appearance to the edges of a structure on a radiograph.

penumbra 
1. Region of very low illumination on a dark background.
2. Zone in which the brightness varies from some illumination to zero (umbra) in the shadow cast by an opaque object intercepting light from an extensive light source. See shadow.


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aiiir: "Ad umbras eorum, qui desperatis amoribus sponte sibi mortem consciuerunt, quorum numerum sese aucturum pollicetur, si tamen quispiam mori possit, qui amore tabidus iam umbra sui est, non uiuus homo.
Actuosa porto lampade discute mentium umbras et grassantis nequitiae conscia, scrutata ingeniorum fibras, phagedaena animorum ulcera tuis balsamo et igne compesce.
Caritatem vos puerum docete, exules pressi a trucibus tyrannis, filii a duris patribus relicti veris in annis; vos, sertes cani, hospitio carentes, debiles, aegri, invalidi per umbras, vos quibus nullum auxilium dat acris publica mensa.
 
 
 
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