Meaning of the word penumbra in English

What does penumbra mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

penumbra

US /pɪˈnʌm.brə/
UK /pɪˈnʌm.brə/

Noun

1.

the partially shaded outer region of a shadow cast by an opaque object

Example:
During the eclipse, the moon passed through the Earth's penumbra before entering the umbra.
The distant streetlights cast long shadows, with a soft penumbra at their edges.
2.

a surrounding region of partial obscurity or uncertainty

Example:
The legal case entered a penumbra of ethical questions.
His early works exist in a penumbra between realism and surrealism.