Penumbrae is a word that describes the area of partial shadow surrounding an object, especially during an eclipse. However, there are several synonyms for the word that can be used to describe the same phenomenon. For example, shadow, shade, dimness, semi-darkness, and half-light are all synonyms for penumbrae. These words can be used interchangeably to describe the partial light and shadow that is cast by an object or an eclipse. Whether discussing the solar eclipse or describing the shadow that is cast by an object, these synonyms can help to convey the same idea and add variety to your writing.