0 the dark inner part of a shadow in which all light is blocked, used especially about a shadow made during an eclipse --
An alternative definition is that the penumbra is the region where "some or all" of the light source is obscured (i.e., the umbra is a subset of the penumbra).
There are three distinct parts of a shadow created by any non-point light source after impinging on an opaque object called the umbra, penumbra and antumbra.
Umbra was not among these escapees.
The second umbra fought, and uses ice.
The word is formed of the privative particle ", and", ("umbra", shadow).
Umbra, a world record-holding dog, can swim 4 miles (6.4 km) in 73 minutes, placing her in the top 25% in human long-distance swimming competitions.
Within the umbra, there is no direct solar radiation.
The spacecraft systems, and the scientific instruments, are located in the umbra of the shield.
