American Heritage Dictionary
(3)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
The umbra is the dark region where no light falls and the penumbra is the grey area where some light falls due to various phenomena.— Kottu
The two-hour flight will follow the umbra, with the aircraft's wide dome-shaped windows providing excellent views.— ASIA Travel Tips.com

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