0 the part of a shadow, especially one made by something blocking the sun, in which only part of the light is blocked -- （日食、月食等的）半影
The moon was completely within the penumbra for half an hour and remained partially in eclipse for nearly two hours.
This is sometimes referred to as the 'ischaemic penumbra'.
A substantial penumbra had abandoned church membership or retained only the most tenuous of links.
The construction of the shield is described and the results of transmission and penumbra measurements are given.
Thus, the prime goal of neuroprotection has been to salvage the ischaemic penumbra and thereby limit the extent of damage.
The width of the penumbra and the distance of the edge of the optical field from the 50% isodose level were measured at a number of points.
These pathological processes may increase the area of cellular damage but the goal of treatment is to preserve potentially viable cells within the so-called ischaemic penumbra.
Following a stroke there is a region surrounding the core of the insult known as the penumbra zone in which the tissue can survive for a period of time.
