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“penumbrae”
1. In astronomy, a partial outer shadow that is lighter than the darker inner shadow ("umbra"): Penumbra is the area between complete darkness and the complete light in an eclipse.
2. An indistinct area; especially, a situation in which something is unclear or uncertain: In astronomy, a penumbra is a grayish area surrounding the dark center of a sunspot.
3. The outer region or periphery of something: A penumbra area is covered by shadiness, so it is not completely dark.
4. Etymology: from Modern Latin penumbra. "partial shadow outside the complete shadow of an eclipse"; coined in 1604 by Kepler from Latin pæne, "almost" + umbra, "shadow".
2. An indistinct area; especially, a situation in which something is unclear or uncertain: In astronomy, a penumbra is a grayish area surrounding the dark center of a sunspot.
3. The outer region or periphery of something: A penumbra area is covered by shadiness, so it is not completely dark.
4. Etymology: from Modern Latin penumbra. "partial shadow outside the complete shadow of an eclipse"; coined in 1604 by Kepler from Latin pæne, "almost" + umbra, "shadow".
This entry is located in the following units:
peni-, pen-
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umbra-, umbro-, umbr-, umbel-
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