penumbra
noun/pəˈnʌmbrə/
/pəˈnʌmbrə/
(specialist)- an area of shadow which is between fully dark and fully light
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- (astronomy) the shadow made by the earth or the moon during a partial eclipse compare umbraTopics Spacec2
Word Originmid 17th cent.: modern Latin, from Latin paene ‘almost’ + umbra ‘shadow’.
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penumbra