A dark area, especially the blackest part of a shadow from which all light is cut off.
Dark shadows gathering at dusk:
Foliage, considered as shade-giving
The pathway or route of such illumination to a person:
Find another word for penumbra. In this page you can discover 5 synonyms, antonyms, idiomatic expressions, and related words for penumbra, like: shadow, umbra, shade, umbrage and light.